Whenever you burn your mouth with food to the point where you can't taste anything else.
Example: Can't Taste it ive got Pie Mouth
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?
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When someone says with your pie face mouth that means when you talk so much and you get on someone nerves and you talk every 5 minutes you find something to talk about and walk around talking.
You talk to much with your pie face mouth with your ulgy tail.