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?"
by miahh June 6, 2022
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you've just got out of school and you are ready to pump up the summer vibe ie: fortnight, you're ready to rock n roll and claw the platypus's nail and shove it up the ass. Really hyped about something.
Teacher: Alright kids, have fun in your summer
Kid to friend: I'm ready to claw the platypus's nail and shove it up the ass.
by lovepenguinsandlife February 23, 2019
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The act of sexually positioning one’s self behind a female or male, with the intent of inserting either said person’s penis or strap on dildo into the receiving party’s guts.
Jason said he just wanted to watch me bang his girlfriend, but he kept creeping up behind me trying to square up on that ass.
by Nrogers June 20, 2022
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Definition: someone who does not care, is overly grumpy, and creates specific unhappiness and shitty behaviors toward others. Similar to a bug up my ass, but on the next level, as getting stung up your ass creates a serious reaction, as opposed to a bug just crawling around all up in your business. Bee up your ass.
Shannon: I can't believe what happen on my commute home from Denver today?
Mike: How do you mean?
Shannon: Some driver had a bee up his ass, and was trying to find a road rage fight
by Shannon307 November 7, 2018
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