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1.
the act of ejaculating in a person's mouth without pulling out.
Any woman can take a creampie, but only a special one can take a mouthpie.
by scazwillis December 21, 2008
 
2.
When you burp, cup it in your hand and throw it at someone.
Oh gross Jimmy, that was the foulest mouth pie ever! What did you just eat?
by melloyellows September 08, 2010