(n) when you are wiping with thin toilet paper, usually from the school, and you apply so much pressure to wipe that you slip and get poo all over you balls.
Ian: Lara why are you so special and not in a good way?
Lara: Ian just drop it like a slippery stick of butter
Ian: Ms McClain can i go to the nurse?
Ms. McClain: Why, Ian?
Ian: My scars hurting...
Ms. McClain: What?
Ian: From all these dementors.
Ms. McClain: What?
Ian: I REALLY NEED TO KILL SOME HORCRUXES
Ms. McClain: Ian just drop it like a slippery stick of butter!