To stick an item usually a penis inside another's butt; commonly found in most imageboards, forums, public restroom walls, 4chan, etc., also usually accompanied with the picture of an angry japanese man shouting into a phone.
A: "I just met this girl recently, but I don't know what to do with her. What should I do?"
What you say when you see a bangin girl and you nudge your buddy basically to tell him that you'd bang the shit out of her. But not always in the pooper, it's just an expression.
I love going to high school games, so many young girls, see that one, yea I'd stick it in the pooper.
Definition 1: A reply to be used when someone thinks they have the answer to a question but another individual participating in the argument proves them wrong with a detailed and knowledgeable answer with no sympathy for the other original participant's dignity or reputation.
Definition 2: A reply to be used when someone replies to an insult or argument with a flawlessly epic one liner or put down.