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1.
party face: the face you put on when somebody's trying to embarrass you in public.
bf: Please... we're at a party..

gf: No, no, no, we'll talk about it now. Just put on your party face and don't try to embarrass me. When a man lies about where he's been... it's not hard to guess the reason. So What's the little whore's name?
by mave73 December 05, 2009
 
2.
When a girl/guy in their 20's party's SO much and SO hard they be looking like their in their 40's
"You see that chick over there, she's single"

"Yeah but that B has got mad Party Face tho"
by SonnyBlackMonster March 18, 2014