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the action of wiping ones ass with a body part.
ohh look at lisa's wrist, what a poo stain!
poostain by Me.me July 27, 2005
A person that has a small patch of discolorated hair on their head.
Check out the size of that kid's poostain!
did you head what happened to Poostains flagship?
No, what happened to it?
The Ukrainians helped its crew install a special upgrade package to turn it into a submarine.
Poostain by HonkyDong May 10, 2022

Poostain Pancake 

Poostain Pancake: To poop so hard and so much, that, there is no more white in your toilet, its all brown and looks very much like a burnt pancake.
Danny: "Eeeeeewwww! Billy just shat a poostain pancake!"
Jonny: "Cool! Want some breakfast?"

poop poo poostain pancake crap
Poostain Pancake by ne-who December 1, 2009

John Poostain

Ah, look at John Poostain simping on Gentry again.
John Poostain by Teilmi February 4, 2020

Poostank 

When you're smashing someone from behind and they then proceed to shit all over your dick with a putrid amount of diarrhea shit which fills the air around you as you inhale the glorious fumes of your girl, you feel at peace and one with nature.
I was smashing my girl from behind going in it raw and she gave me the poostank!
Poostank by Mr Bobba June 4, 2020