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