Shorthand for Burning Man, a festival over Labor Day weekend (and the week previous). It started in the 1980's, and the 2007 event had 47,000 people. It occurs on several square miles of dry lake bed in northern Nevada - the Black Rock Desert. The community (4th largest city in Nevada) is called Black Rock City. Burning Man has incredible art, hundreds of pieces, such as one of 2007's: a 100 foot oil derrick 'worshiped' by 30 foot metal sculptures of people, all of which was blown up/burned on Labor Day weekend. Many unusual vehicles drive over the dry lake bed, such as mobile Couches, Dragons built on bus chassis, bakers dozens of moving Cupcakes, Unicorns, etc. Everyone is a participant - no spectators. Nudity is common, appropriate given the heat. There is no vending - it is a gift economy. Burners, as BM folks are known, share a common spirit of freedom, art, self reliance, self expression and a generous spirit.
"I just got my BM tickets!"

"I was at BM from 1999 through 2007."

As seen on a bus heading up to BM, "BM or Bust!"
by Michael's Couch October 09, 2007
Top Definition
acronym for bad mannered, used by korean computer players.
You very BM player. THX thx. kakaka
by rustyn December 24, 2007
Bowel Movement
When listening to the Don and Mike show, I had to take a huge BM
by ghandi February 25, 2003
Also an acronym for bowel movement. Used in in assisted living or healthcare environments typically.
Did you record the time of his last BM?
by CJ August 12, 2003
Abbreviation for "Bowel Movement"
Family Guy S3E14: Chris: What's a library Dad? Peter: Oh it's just a place where homeless come to shave and go B.M.
by Heavy D February 02, 2005
Acronym for Bad Manner(ed), popular in the Starcraft (II) community.
John and Zoe take their time to wait for Jack to join their game, and Jack leaves immediately upon it started

Zoe: Jacks so BM.
by Advertos March 12, 2011
Bowel Movement
Take a crap
Take a dump
drop a load
put a brown log in the water

You know; TO TAKE A SHIT.
Damn Cindy, when you made a BM I could have sworn that the whole fucking room shook. It smells like a sewer pipe busted in here.
by I forget February 15, 2005
Short for bowel movement.
The act of dropping shit
Sorry, I need to have a b.m., where are the jakes?
by Sylvain August 01, 2004
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