1. a tribal call issued by one roommate to another during the early hours of the day in order to get their attention
2. an explosion of verbal approval, usually issued by a mentally imbalanced individual
3. an expression of indifference when caught red-handed in a precarious situation and there's nothing else that can be said to defend oneself
4. an insult issued in anger, telling another person to "die"
Roommate 1: Deh! You want to grab a burger?
Roommate 2: Sure.
Roommate 1: Deh!
"Deh! Have a nice deh, to-deh!"
Roommate 1: I just saw you drink all of my beer, dude!
Roommate 2: Deh.