So it started with user dibbs-n-scribbs over on Tumblr with the first image. I said something about Ania and Maisie so they made the second. And then I was struck by inspiration and ended up making the last two myself.
I think it's in Chinese, but it's definitely asian, so it could also be japanese or Korean. It's a sequence first, guy sleeping in the sun and I think his friend moves his hand on his stomach to it makes a shape in the tan. And he's annoyed and so they put tanning oil to try and even it out. and then later on he reveals, to everyone's hilarity, that it just tanned darker than the rest instead.
It may have been a douyin video. I wouldn't know for sure since I saw it on tumblr.