Punching your hand inside someone's asshole and then you open the asshole and tickle the inside.
The sensation feels like rats crawling up your ass, hence the name.
Nick (you, a kinky motherfucker): "Man, Lisa just gave me rats up my ass."
Mike (your childhood friend who respects you very much, up until this information which has entered the neurons in his brain matter): "What the fuck?"
"Im going to shove it up your ass if you don't stop!" he says.
I decided to shove a snowball up their ass
Leanne: What's the phrase for teachers pet? Is it 'sucking up your ass?'
Joshua: That's the dumbest thing I think you've ever said
when its such a good time it makes you feel like you're having an orgasm
john:dam it feels like a dick up the ass
james: so true bestie
stuck on someone who is not good for you, like a bad ex gf or a two faced backstabber wanna be frenemy
"all they do is talk shit, I cant understand why he's caught up in their ass"
day dreaming about a guy/girl who will never be with you
Today I have my head up my ass about chris