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1. phass
phat + ass = phass. A nice juicy booty. "Junk in the trunk." A sexy butt that is both fat (as in "juicy") and cool/phat (...because it is so hot!).
Shake dat phass girl.
2. phass
one who has no butt formation, a flat saggy ass with no bump or rounded shape.
Look at that bitches phass!
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