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?"
B: "I'd stick it in the pooper."
C: "Stick it in her pooper!"
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