What is After Party?
1.
a party that occurs after another party.
2.
A party after a party, a party when girls and guys get naughty and have drugs.
Welcome to the after party, hope that you feelin naughty, I'm leaving here with somebody, so you got me like WHOA WHOA WHOA
3.
Generally coming from Hollywood slang for a better, more fun party, occurring after another, more boring, party.
May also be used to describe activity that occurs after the club/bar scene is closed for the night.
"Seriously hate these work-related shin-digs."
"Don't worry. There's a kick-ass after party at Kate's. We just have to lose the big-wigs."
"Why do the clubs close at two?"
"S'all right- after party at Tom's- just stick w/ me."
See
4.
A bunch of kids in a "party" taking E and thinking of them as cool guys.
Did you see all the freaks at the after party?