If I had to guess I’d say it’s a bit of a nostalgia thing. There’s always been the cartoon trope of characters sucking on something sour and their mouths pucker up.

what if we shoved the lemons up the butthole?

Shh, don't give them ideas

Have you ever eaten a lemon before?

Yeah, and?

Then how do you not know what eating lemons does to your face?

Look, I get the sensation of a darn lemon. I question the surge of this meme.

It resurfaces every few years lol

someone made a meme of a pokemon licking an lemon, and it sucking their face in, then like every meme, EVERYONE had to make their own take of it.

notable ones, beyond the first;
- a drop of lemon juice into a glass of water, the glass crumples up.
- a goat kid dose the meme, but instead of face inverting, she calls for her father cause "the fruit bit her!"

it started out funny, then it got overused really quickly ;-;

Memes are just all kinds of random