The act of going somewhere solo and not inviting the boys or going with a diffrent group of boys and leaving your real boys hanging, this aplies to woman also but it is still called dtb
E: Chillin in the city
Charlie: Wtf your supposed to be coming to the party dtb!
Girl: "Hell yeah I do, I'll bring the beer."
Guy to his guy friends: "Man, that girl is totally DTB"
Added to the end of a text message when you don't want the other person to respond.
Usually used when one only has a certain number of text messages per month, and doesn't want to waste one by having somebody give an obvious response to the initial text.