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a dumpster that has been flipped over for a bum to live in.
joe : "its not a dumpster its a bumpster"
A person who often gets blow-jobs on the toilet
Dane Derouin (Famous Hate Model) is a blumpster
Blumpster by 9289515257 May 16, 2011

Bumbsterbate 

When a homeless man is so lonely and bored, he has to whack it.
Yesterday in McDonald's, I walked into the bathroom and I heard the sound of the bumbsterbate, so there mus have been some dirty beatings going on in there.
Bumbsterbate by DomainofBEEP March 17, 2009
John took a poo while receiving fellatio in the dumpster, hence a blumpster
blumpster by Grady the gangsta November 15, 2005

Blumpsterbation

Blumpsterbation is to masturbate while taking a dump, derived from the term Blumpster.
Man, the other day I was doing some blumpsterbation but the smell got so bad I couldn't even finish.
Blumpsterbation by Khaytsus January 29, 2008
A homeless person who lives primarily in Dumpsters, especially in the Champaign/Urbana area.
We would always get to see the bumsters whenever we went to a U of I game.
bumster by livesathome February 6, 2009