Meaning

noun obscene terms for feces

noun a stupid foolish person

noun slang terms for inside information

originUncertain, possibly from Middle English poupen (“to make a gulping sound while drinking, blow on a horn, toot”). Compare Dutch poepen (“to defecate”), German Low German pupen (“to fart; break wind”). Also representing poo pronounced with the mouth snapped closed at the end.

Etymology from Wiktionary, CC BY-SA 3.0