Breaking the Fourth Wall: When pressed for wordcounts, some authors insert their personal thoughts into the story, directly addressing the audience or characters as a writer. It quickly becomes Hilarious in Hindsight.
Chandler's Law: "If all else fails, have a band of ninjas attack somebody" is official advice for writers at a loss for material to further their novel's word count.
Cosmetic Award - The first and foremost prize for completing Nanowrimo is ... the mere satisfaction of completing one's novel. And a purple wordcount meter.
Some of Nanowrimo's sponsors, on the other hand, offer slightly more tangible prizes for winning, such as CreateSpace offering to print up to five free copies of the winner's manuscript, and Scrivener offering a 50% discount off their software's purchase price.
Determinator - anyone who actually finishes a novel. Writing 1,667 words a day may not seem very hard, but doing it every day, for a whole month takes dedication!
Not Cheating Unless You Get Caught: ...actually, no one really cares if you do, either. There is even a forum just for "Nano Rebels". In a sense, NaNoers are actively encouraged to "cheat" by artificially inflating their wordcounts—No Plot? No Problem, the semi-official handbook by Chris Baty, NaNoWriMo's creator, offers several tips on how to do this.
You're supposed to start a new novel on November 1st, but some people continue working on the same novel (not a sequel) as the previous year(s).
Padding - As mentioned above, there are many, many ways to inflate one's wordcount without necessarily contributing to one's plot development. Such as:
Removing contractions ('do not' vs 'don't').
Giving characters multi-word names or fanficul titles and insisting on a Full Name Basis (or simply repeating them often).
Having a character sing along to a song on a radio, or recite lines from a play/novel/movie.
Giving characters particular Verbal Tics, like stuttering, to up your wordcount. (paraphrased from No Plot? No Problem! "Give your character a stutter! Not only will it allow you to double all their dialogue, but everyone else in the story can spend pages wondering where the stutter came from!")
"Never delete anything. If you can’t stand to look at it, just change the font to white and keep going." (from a 2011 pep talk by Erin Morgenstern)
Portmantitle - the official nickname NaNoWriMo falls somewhere between "portmanteau" and "acronym".
Post Count - Some of the best-known NaNoWriMo forumgoers are the ones with the highest post counts. The NaNoWriMo forum has an entire subforum devoted to procrastination, which is filled with games and conversation threads. Some users use these threads simply to increase their post counts.
Self-Deprecation - Participants tend to frequently criticise their own novel's plot, characters, and (especially) blunders — but mostly in good humor; blunders in particular are lovingly christened "Nanoisms" (allegedly a portmanteau of "Nanowrimo" and "aneurysm").
Self-Imposed Challenge - Some users set a personal goal of a "Double Nano" (100,000 words in 30 days!) or more — 200,000? 500,000? Yup. There are even a few who have challenged one million words in 30 days. And still succeeded.
There's also a Dares thread in just about every genre forum, where users think up crazy stunts for other users to insert into their novels.
Sturgeon's Law - First-time participants are advised that at least 45,000 words of their novel (if not all 50,000) will be "utter crap", and to learn to love it anyway.
The Insomniac - Most NaNoers become this pretty quickly!
Thread Hopping - When the quick reply method was still around, some users would just read the first post, scroll to the quick reply section of the page, and reply without reading any of the other responses, especially for threads of the "share with the group" nature.
Thread Necromancy - One famous thread on the procrastination forum is Thread Killer, in which users attempt to make the last post in the thread. Of course, the next poster unkills the thread, and users will go on for scores of posts creatively attempting to kill the thread.