A)Can sometimes be used as a playful insult among friends, especially if one of them has done something stupid or absentminded;
B)Can be used as a semi-serious insult, as when person A has actually been offended by a comment or action done by person B, but person A does not wish to get into fight; he merely wants to express his annoyance;
C)a common nickname for people in the 2006 class at Cincinnati Country Day School; synonyms in this situation are douschebag, douchebag, douchefuck, chickenshit, and dumbass.
Guy 2: Haha, you dbag, you're gonna fuck up on your Physics test now.
Guy 1: Shit! I completely forgot about it!
B) Guy 1: You dbag, why did you ditch me at the movies last friday?
Guy 2: I'm sorry man, I got the munchies.
C) TJ: I called Dbag last night; he said he's up for the Halo tourney
Keesh: Which Dbag? Pierce, Lang, Odin, Johnny Gill, or Tim?