Your anus/rectum being flipped inside out to resemble a penis.

Pee-penis
Poo-poonis
Jim pushed so hard when he was taking a dump he ended up with a poonis.
by Poonisdude1014 January 1, 2009
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when u dip ur penis in some poop it becomes poonis
"dip my penis in some poop call it a poonis" - james budahar
by MadeThisAccountForPoonis July 8, 2020
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A derogatory term for young, sex-craving women/sluts.
Hey, son, did you see all those poonies running around town?
by Fat Washington November 6, 2003
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combination of penis and poon;

1)can be used in reference to a dike, tranny, homo, etc.

2)can be used to express how ugly a person is.

3)when your swimsuit is old and ratty and it sags at the crotch, it looks like a poonis.
That dike must have a poonis, I can't tell what it is.

That bitch looks like a poonis.

Get a new swimsuit you look like you have a poonis.
by secretscrotum January 7, 2009
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What you get after fucking a guy in the ass when he hasn't taken a dump in a few days. A Penis covered in Poo.
Grandpa (in a pirate voice): arrrrrgggg, Billy. Me matey. Shiver me anus!

Billy: first mate reporting for duty!

Grandpa: 'tis a fine instrument you got there, Billy. All hands on the poop deck.

Billy: oh Gramps. Here it comes...

Grandpa: garrrrrrrrrrrrrrrrrrr. That's the stuff.

10 minutes later:

Billy: awwwwww - sick. Grandpa, I have a Poonis.

Grandpa: yarrrr. Gross. Time for a colostomy bag...
by Pollup August 8, 2008
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