Bobby Party 

A party with the intention of partying,which turns out to be a major cockfest filled with stoners,along with 2 or 3 grenades or emo girls who turn out to be lesbian
A clue that it is a bobby party is when the guys get Shit faced drunk while they all hit on the only one girl present.
Coencidentally turns out that the girl has a boyfriend,who is also drunk at the party.Usually these Bobby parties occur in the suburbs of the south bay,from san jose to santa clara.
The key point of

yeah right,its probably a bobby party

Bobby Party by Coleman Dylan April 21, 2011

party booby trap 

A trap, intentional or otherwise, set by dropping a smoked cigarette into a half-full bottle of beer, thus obscuring the cigarette butt. Also, a great palendrome.

"Aw man, Elliot left me a party booby trap! My Urquell's ruined!"

party booby trap by Max Boschert-Zielsdorf April 23, 2005