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a mix between two items, a dick or penis and a poo. together they make a poo-nis, get it? good. it has many disriptions: a piece of poo shaped like a penis, when you have runny poo, when you poo on your boner, a word to replace stuff and a burn.
u: look in the toilet
guy: holy crap! thats a large penis shaped poo!
u: its a poonis!

u: uhg!!!!!!
toilet: (splatter splatter)
u: ew a poonis its all runny

u: what a hot babe
your penis: (sproing)
u: oh shit I pooed on my boner, a poonis has occured

zac: oh no i dropped my jewish hat, can you pick it up?
u: what your jewish poonis?

matt: you suck
U: go die in a hole with poonis' in it
Poonis by The Random guy April 25, 2006
the genitalia of a hermaphrodite (part poon and part penis)
POONIS by David September 28, 2003
Used to describe a penis that has been pooped on or dipped in poop.
David pooped on maguires Penis while they were having sex and maguire had a poonis
Poonis by Chunky poop lover November 4, 2019
Sara: ugh Kyle is such a poonis

Chad: i know right, just man up pussy
Poonis by Connardinkley May 13, 2020
The act of dipping your penis into a steaming pile of poop.
Jessica: “The sex wasn’t going anywhere until he whipped out his poonis.”
Poonis by CpSkeletor May 25, 2020
"Is your poonis on fire?"
Poonis by Kris fuckskey October 30, 2002
Someone who smells like a cross between shit and fresh dick.
Damn, girl! You smellin' like poonis!
Poonis by Bryce Craftmaster March 7, 2003