An acronym for the band called Dave Matthews Band. Known mostly for their shitty ass music. Quite honestly, they are one of the more overrated bands out there.
kid 1: hey man, let's smoke up
kid 2: ok, let me put on some music. *plays DMB
kid 1: what the fuck man!?!? *pukes all over himself and takes a shit on the cd*
DMB is a activity that you pick your hook up and you do what ever you want. usually started with 4+ girls and guys and they choose who they want to "DMB" or "Draft"
"No. There is no way I would go out with that one. She has been out with all the guys in the town. They all say she is a DMB. Several of them had to go to the hospital for a check after they had been out with her"