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Someone who talks a lot of shit... or is a one upper.
Shut up Poop Mouth, you did not climb Mt. Washington!
by Craig Gauthier April 14, 2007
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when someone has yuk mouth.
That chick was hot but she had poop mouth
by Will.b October 03, 2006
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1. Refers to anyone who displeases me in a manner which doesn't deserve harsher treatment. See example 1

2. Term of endearment to people close to you. See example 2
Example 1
Person 1= Can you please hand me that pen?
Person 2= Get it your self.
Person 1= FINE! POOPMOUTH!

Example 2

Friend 1= Hey what are you doing poopmouth?
Friend 2= Not a whole lot of anything.
Friend 1= Nice nice...
by AngelousBelleMorte June 06, 2009
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