What is Pompy?
1.
an ass. another word for booty.
man she has a nice pompy.
damn that pompy is THICK.
whoa loook at that pompy go!
See
2.
To be show-offy, narcissistic, pompous
"You know that girl who always wears those abercrombie and fitch clothes and rides a BMW to school? Yeah she's so pompy."
"Oh man. Peter always thinks he's right about everything. He's so pompy!"