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3.
A gathering of a group of gay men in an alley next to garbage dumpsters for the purpose of engaging in a homosexual orgy. One or more of the men often lean against a dumpster while giving or receiving a sexual move. Dumpster parties often occur late at night in alleys next to bars or fast food restaurants.
Let's meet up in the alley behind the Manhole bar in 10 minutes for an impromptu Dumpster Party. Several dudes are really going to give it to Diamond!
by Bolton March 28, 2011
 
1.
A group of people gathered in a alley by the dumpster of a nightclub in an attempted to get primed before entering said nightclub. Each person is required to have 750ml of their favorite spirit to partake.
"Why should I pay $10 for a highball at the Mynt? Everybody get a TwoSix and we'll hold a dumpster party!"
by spennym May 02, 2007
 
2.
The act of throwing a dead person, typically a woman, into a dumpster.
"I hate that bitch so much, someone should throw her a Dumpster Party
by EnglishBill March 24, 2011