Down To Make Bad Decisions. Many times, this refers to the state of mind that college girls are in after they begin to feel slightly (read: heavily) intoxicated.
Similar to DTF (down to fuck), but intercourse is not necessarily involved.
Guy 1: Dude, are you coming to the party tonight?
Guy 2: Oh yeah man, there will be so many girls who are DTMBD. It's going to be awesome.
Guy 1: That's the spirit.
This term is used by BlackBerry users when someone asks then for their PIN and they do not want to give it. The term can also be used in a sarcastic/comedic way (see example 1b below).
The term rose to prominence through the backlash to instant messaging in favor of more traditional terms of communication.
1
a) Girl: Hey Charlie what's the deal? You never send your PIN?
Charlie: Are you for real? Don't Tell Me BBM/DTMBBM!
b) Girl sees a hot guy: Mmm, he can tell me BBM any day of the week.
c) Guy sees unattractive girl: Jeez, DTMBBM if you know what I mean.