(v.) 1.{literal} ~(ing) is the act of throwing a sandwich, commonly a roast beef sandwich (in a plastic sandwich bag) at an unsuspecting passer-by. 2.{general} to be ~ is to be unsuspectingly attacked, defeated, or rendered into a humiliating situation.
1.
Dude.. did you hear? Will Roast Beefed this random choir dude in the hall.
2.
Shoaib: Aww no that was my last life...
Miranda: YOU JUST GOT RAOST BEEFED!
3.
Parsons: {playing Killer Bunnies} AHHHH I just got Roast Beefed!
In the film "Napoleon Dynamite" Napoleon throws an orange at Uncle Rico's van. Rico jumps out and puts Napoleon in a headlock. Napoleon elbows Rico and escapes, but as he runs away he attempts to jump a fence and "beefs it". Yes, Napoleon really "beefed it". By the way the "beefing it" was NOT in the script. It was a real "beef" made by the actor playing Napoleon. It was so funny they left it in the film.