Top Definition
A dumbo who has poo for brains and therefore thinks stinky thoughts.
Mitch: Why don't you like me
Kath: Mitch, you're a poo brain
by KathyK May 25, 2008

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An insult applied to a dim-witted, brainless person.
"I've lost my car keys."
"You poobrain!"
by McGonagall April 24, 2006

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A poobrain pu-brane is a cranial sheister.
A turdiliacus of the highest order.
Usually recognized by an indiscrete smell of faeces.
Popular usage: Don't be such a "poobrain" you egg-head Sheister!
by Holster April 25, 2006

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