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1.
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
de KathyK 25 mai 2008
 
2.
An insult applied to a dim-witted, brainless person.
"I've lost my car keys."
"You poobrain!"
de McGonagall 24 avril 2006
 
3.
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!
de Holster 25 avril 2006