Top Definition
Poo.cus.sion \pü-kə-shən\

When one incurs a concussion upon smelling feces and experiences moments of extreme and ambiguous disorientation (not to be confused with 'Poocushion')
Example One:
Thaddius - "Hey man, you weren't making any sense yesterday after you left the bathroom at Chili's"

Cam - "...oh no, I must have suffered a Poocussion"

Example Two:
After experiencing a severe case of Poocussion of the most seldom occurrence Frank stumbled around the apartment for the rest of the afternoon mumbling to himself.

Frank - "I'm gonna, I'm gonna, I'm gonna, I'm gonna, aahh I'm gonna...gonna, gonna (sigh)"
by Principal Midget December 12, 2010

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