Pidge mentions liking peanut butter once, but the fandom has transformed it into a full-blown Trademark Favorite Food.
Redraw Lance explanation Many people have been finding random photos (Usually stock photos) with people doing funny/unusual things and redrawing them as Lance doing them.
Space Dad explanation Shiro is the oldest and most mature Paladin who looks after his team mates and provides advice to them.
People comparing Shiro to Bucky Barnes and/or Captain Americanote Shiro from the show's outset Shiro had a lot in common with the MCU version of Bucky (cyborg arm and backstory as an amnesiac captured, tortured, and experimented on by the enemy) as well as Cap (his leadership, Heroic Build design, and personality), leading to many jokes about it and some even describing him as their lovechild. The memes shot up further after season 6 due to its Whole-Plot Reference of the climax of The Winter Soldier and aspects of Keith's backstory resembling Cap's.
After seeing how protective the Red Lion was over Keith in Season 2, coming for him whenever he's in danger, people have been exaggerating it and making references to the lion coming for him over even the smallest injuries.
These screencaps of Lance have been making rounds to express when someone is feeling particularly smug about a situation.
After the show's Instagram page announced that Shiro's birthday is February 29th, people have started to make jokes about him being only 4-6 years old.
Zarkon's obsession with the Black Lion has been noted by some to be similar to a crazy-ex boyfriend losing their girlfriend and trying desperately to get her back by fighting her current boyfriend, Shiro.
The fact that Pidge turned out to be Italian has gathered a large amount of jokes using her to portray Italian stereotypes. This includes saying she loves pasta and even her dressing as Mario. Even her voice actor joined in on it.
Keith loves hippos.note A quiz in the Paladin's Handbook implied that hippos were Keith's animal of choice, which took off due to how Adorkable it was.
Keith hatched from an egg. explanation Some people wondered if the Galra reproduce by laying eggs, and since Keith's Galra heritage comes from his mother, then that would mean he would have hatched from an egg.
Stripper Lance.explanation In episode four, Season 4, Lance descends a rope while doing a routine that looks a lot like a pole dance, leading many to make the joke that Lance worked as a stripper, or at the very least took pole-dancing lessons.
Shiro's boobs. explanation His pectorals are often drawn rather... prominently in many scenes, leading to endless fandom jokes about his large chest and portrayals of him as an Innocent Fanservice Guy.
Also with Romelle to a lesser extent, due to a frame that implied her to have a large chest.
Epilogue Wedding Edits Finale Spoilers The final shot of the show is Shiro marrying Curtis, a very minor background character. The scene's slapdash Author's Saving Throw nature and Curtis's obvious interchangeability, to the point that audio descriptions originally identified him as an entirely wrong character, and a version of the scene leaked two months beforehand originally had Curtis as a wedding guest while Shiro was with a completely different man (a cameo of Roy Fokker from Super Dimension Fortress Macross), made it ripe for mockery with people editing other characters in as Shiro's new groom.
"[X] IS CANON KING". explanation Originated from a saying by "Klance" shippers, is now used either seriously or as a joke amongst the fandom.
Bunny Shiro. explanation After season 7 the amount of fanart associating Shiro with bunnies and Bunny Tropes exploded to the point the fandom has adopted it as his representational animal.
Leakira AUs.note Season 7 killing off Adam and pairing Lance with Allura caused many in the fandom to be very angry, in response proposing a remake of Voltron Legendary Defender that purported to correct its various representational issues. While the exact details varied from fan to fan, the AU would generally ditch the Mecha aspects in favor of being a romantic drama focused on Klance Expies Leandro and Akira, with other characters being Race Lifted into humans belonging to various underrepresented minorities. This brought its own share of backlash since the most popular takes on the AU were perceived as singlemindedly shipping-focused and/or Political Overcorrectness to the point of being considered more racist (e.g. naming Shiro's Expy after a dog, turning Nyma into a Roguish Romani, and depicting the Galra as hijabi Muslims), to the point that Leakira acquired a double meaning as a byword for fans with a Know-Nothing Know-It-All mentality.
screencaps of Lance have been making rounds to express when someone is feeling particularly smug about a situation.