Rational Wiki is a skeptics' wiki. It was created as a negative reaction to Conservapedia. There have been some efforts to move it more in the direction of debunking, refuting, or poking fun at pseudoscience, religious fundamentalism, authoritarianism and other things that it doesn't like, per its stated mission statement:
Analyzing and refuting pseudoscience and the anti-science movement.
Analyzing and refuting crank ideas.
Explorations of authoritarianism and fundamentalism.
Analysis and criticism of how these subjects are handled in the media.
Functionally, it's more like a group blog than an encyclopedia (which they themselves acknowledge), though it also has quite a lot in common with Robert Todd Carroll's Skeptic's Dictionary. It also has a page about TV Tropes.
Conservapedia administrator TK passed away in December 2010, eliciting this response on RationalWiki.
RW noticed his absence and did the legwork to learn of his passing, while CP only seemed to learn of it afterwards (so quickly that it appears that they learned from RW), but have barely even noted the passing of one of their most prolific editors and authoritarian admins.
Arch-Enemy: Conservapedia is portrayed as this (the site was created as it's opposite), though it's obvious that Rational Wiki views them as a loud annoyance more than anything.
Armoured Closet Gay: Described as part of Haggard's Law, which states, "The louder and more frequent one's objections to homosexuality are, the more likely one is to be a homosexual." It even has a link back to the Armored Closet Gay trope page.
Catch Phrase: Goat. This is probably a reference to Matthew 25:31-46, where Jesus says that in the end times he will separate the sheep (his followers) from the goats (his detractors). Or maybe it's just because goats are awesome and tasty. Take your pick.
Chuck Norris Facts: Subverted. Their article on the man includes a few claims in the style of the meme, but instead of making him look badass, they make him look pathetic. In fact, RationalWiki is probably the only place on the whole Internet where Norris isn't treated as a Memetic Badass.
Cursed with Awesome: If you've been around long enough (a few weeks or days) and are generally thought to be trusworthy, you will be demoted to janitor (i.e. sysop). (Frivolous block wars are common, and encouraged; fortunately, in addition to non-serious block reasons (such as one that outright says "block war") there are options to make said blocks last only a few seconds, which help differentiate them from serious blocks.) If you anger the gods sufficiently, you may even be further demoted to the lowly, despicable position of bureaucrat.
In the article disproving a global flood: "How was the fossil record sorted in an order convenient for evolution if they were laid down in the turmoil of a single flood? That is usually dismissed with a hand wave by saying the animals quickly sorted each other out based on their ability to compete for the shrinking high ground. The theory also fails to take into account fossilized plants, which show the same type of order as animal fossils, and which are not noted for their ability to flee rising floodwaters."
A similar example of deadpan snark is found on the page regarding the Peanut Butter Argument that life should arise naturally in a jar of peanut butter if evolution is true: "Critics of the argument have pointed out that sealed jars of peanut butter are not, generally speaking, billion year-old volcanic environments rich in ammonia and methane, being bombarded by high energy cosmic rays."
Don't Shoot the Message: In-Universe, despite the sites' general left-wing leanings, their article on Michael Moore is rather critical, claiming the only difference between him and Rush Limbaugh is that Moore supports universal healthcare. Similarly, despite being a heavily atheistic site, they don't find the arguments of Christopher Hitchens very convincing. (In Hitchens' case, it's partially due to his pro-war and pro-life positions, but his religious positions come under fire as well.
More generally, they treat left-wing cranks like Globalresearch.ca just as harshly as they do right-wingers like WND, although they do perhaps have a numerical bias - likely due to the general leanings of their contributors - towards attacking the right. Even Noam Chomsky is criticized for his "highly questionable statements" regarding genocide at Srebenica, Kosovo, and Rwanda, and his quasi-defense of Holocaust denier Robert Faurisson.
Fan Nickname: They makes up names for all of their friends at Conservapedia.
Aschlafly is referred to as Assfly
Conservative is referred to as Kendoll, or simply Ken
Karajou is referred to as Karajerk or Kowardjou
Jinxmchue is referred to as Jinx
There were numerous names for TK, including TeamKiller, TrollKing and TheKnife
Edit War: On RW, edit wars and even wheel wars are extremely common. So common, in fact, that accidental edit wars have become an issue - sysops assuming vandalism where there is none and performing knee-jerk reverts of edits without reading them, the original contributor re-adding the edit, and things kicking off from there.
Insane Troll Logic: Described in their page on "Not Even Wrong", referring "to any statement, argument or explanation that can be neither correct nor incorrect, because it fails to meet the criteria by which correctness and incorrectness are determined." Given their skeptic and debunking mission, they run into this kind of thing a lot.
"Indigo child" is not to be confused with "In dingo child", which is what your child might become if you misplace it in Australia.
Kicked Upstairs: Any user who sticks around for a while and regularly makes edits will be saddled with the tedious responsibility of being a (ugh) Sysop.
The Lab Rat: Rational Wiki consists mainly of science geeks (with a few actual scientists and physicians scattered here and there). It is sometimes referred to as Rat Wiki, and its members are supposedly referred to as 'Rats' by those opposed to the site, although there is precisely zero evidence of anyone actually using this terminology.
My Country Tis Of Thee That I Sting: Pretty much the only countries that aren't criticized heavily are those in Scandinavia, though most editors are not from there. The United States gets hit particularly hard— it is practically obligatory to criticize it every time it is mentioned, though the vast majority of editors are American.
Ninja Pirate Zombie Robot: Ironclad describes himself as a "liberal, homosexual, socialist, atheist, black, British, history-degree-educated PhD-level academic bodybuilder".
"Not Making This Up" Disclaimer: On their article about Andrew Schlafly, to let us know that he really wants to make his own translation of The Bible, as he thinks that every current translation is too "liberal", applying Canon Discontinuity by removing some verses that are the basic tenets of Christianity in the process, even though he admits to having no knowledge of the original languages.
Sarcasm Mode: Prevalent, for example, in the article "Fairies". Often these tend to be Blatant Lies followed with the marker Do You Believe That? to hint to the reader that the author didn't actually believe that.
Sliding Scale of Silliness Versus Seriousness: It's somewhere between TV Tropes & Uncyclopedia. The main article on Andrew Schlafly is one of the few that is explicitly stated to be intended to be completely serious, though a parody article on him also exists. Regardless of the silliness or seriousness of a specific article, unless it's in the separate 'Fun' or 'Essay' sections of the site accuracy is non-negotiable (at least in theory).
Stay in the Kitchen: Their page for that is "Kinder, Küche, Kirche" which is German for "Children, Kitchen and Church". Since they do a lot of analysis of fundamentalism, authoritarianism, and individuals with very firm ideas about traditional gender roles, this gets cross-linked a lot.
Take That: Mostly against fundamentalists and authoritarians, though no one is completely spared, not even the site itself.
The wiki's origins as an anti-Conservapedia still tend to show clearly in any article about a right-wing politician or political position; they don't even pretend to be neutral.
Understatement: "Critics of the argument have pointed out that sealed jars of peanut butter are not, generally speaking, billion year-old volcanic environments rich in ammonia and methane, being bombarded by high energy cosmic rays."
"Since the time of Lovecraft, several real books have been written and published under the name Necronomicon, though none are known to have the mystical powers attributed to them by Lovecraft’s stories. This is generally thought to be the maximal-utility state of affairs by those who prefer not to have soul-eating eldritch cyclopean gibbering madnesses called into our world out of indescribable gulfs beyond all sane conceptions of space and time."
Troll: Marcus Cicero, LBHS Cheerleader, TK, Rob Smith, D Morris, take your pick. The site's dangerously lenient ban policy results in it being a veritable troll heaven—it takes weeks for the site's members to even decide that they might want to possibly ban someone, and even then it's pretty much always a short-term block that does little to actually stop the troll from vandalizing the site.
TV Tropes Will Ruin Your Life: Their now-deleted article Conservapedia:Boycott listed visiting TV Tropes as an alternative to reading Conservapedia and laughing at it. They added the comment "Kiss your spare time good-bye."
The Wiki Rule: There's a wiki called 'RationalWikiWiki' which exists to catalogue and analyze the history of the RationalWiki community; it exists mostly as a joke, but has still managed to accumulate several hundred articles. There's even RationalWikiWikiWiki. That one exists entirelyas a joke.