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2.
1) when a party hat is placed atop a boob

2) a boob that likes to party
1) Why have you placed a party hat on your boob? Put it on your head, you don't want to have a partyboob.

2) Your boob is so happy! It loves to party.
by leneville12 May 27, 2012
 
1.
Boobytrap backwards.
I disarmed that boobytrap. PARTYBOOB!
by TheNiggerMane May 14, 2012
 
3.
Partyboob: A female breast which tends to posses lower inhibitions than the other breast as it is better looking, similar to how people prefer to be photographed from one side.
"I always flash my left boob at parties because that's my partyboob".
by Johnels July 25, 2012