When you have anal sex with a girl that hasn't gone to the toilet and your dick gets shat on.
"Dude, Jess totally forgot to do a shit before we did anal!"

"Unfortunate man, you got a poonis"
by frobrowilldo July 12, 2014
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A hairy fucker who has a penis covered in warts and fungus. Can also be someone who has a tremendous amount of STIs
Beck "Jack is so sexy"
Bethany "What?! He is a poonis!"
Beck "Eww. Nevermind"
by GoofyNoofyIRL July 29, 2020
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A Poonis happens when your taking a poo, and you have an erection at the same time. Note* This must also be a natural boner.(no porn allowed)
Oh boy, I feel a Poonis coming along!
by Bossplaya January 05, 2004
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When you sit down to take a shit but your penis dips into the last user of the toilets poo
Jimmy (taking his dick out to masturbate on the toilet): Oh fuck, not a poonis again
by Big_Dick_Cockroaches March 08, 2021
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The rest of the definitions are wack. A poonis is simply a penis that has poop on it.
I pulled out of her ass and slapped her face with my poonis.
by Crushing_Doom November 11, 2009
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A penis which is able to poo.
1) Your poonis may be bigger than mine, however: mine creates larger poochunks than yours on average.
by celllphone May 26, 2009
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