1. The buttocks, ass, bum or posterior.

2. Through which one shits.

3. The actual toilet.

The pooper is clogged. See - Shitter, Crapper, Toilet

4. A word for small children, as they don't do a lot more than eat, sleep, and poop.

How's the little pooper doing? See - Crothling, Womb Lice, Cocksmurf

5. A mild oath for something bad that has happened.

How was your day?
It was a real pooper.
See - Pisser, Bitch, Clusterfuck

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