Jump up my Ass (Southern US slang) A verbal berating, often in public among one's peers. When a person in a superior position belittles and/or humiliates you.
Jeez, did Sergeant Major really need to Jump up my Ass like that? All I did was mix up some ammonia and bleach so I could clean the floor of the barracks!
Acronym from the mid eighties. Along the lines of PONTIAC ( poor old nigga thinks its a Cadillac), Ford ( flip over read directions, found on road dead) or MOPAR ( my old pig ain't running). That's what you get when you have a bunch of bored fifth graders.
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?"