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1.
Military slang for the event in which somebody gets yelled at or insulted by a fellow service member.
Soldier 1: Your bitch is probably fucking some dude right now.
Soldier 2: Don't you EVER talk about my girl or I'll fucking kill you! Got that you fucking dirtbag?!

Random Soldier: Briefed!
by BoxingBro December 10, 2009
 
2.
This is the event when your boxers slide up into your groin to form a brief shape. (Y-fronts)
A: *takes off trousers*
B: Jesus man! you got briefed! EWWW!
by George_m June 09, 2007