Short for
butt-fucked, boofed is usually expressed as a verb in the past-tense
participle, related to consuming drugs or alcohol through one's anus.
To "boof" something can also be
synonymous with stealing that item (often by putting it down ones pants), depending on the context of the situation.
Bobby: Bro, I totally boofed 3 beers in my asshole
last night!
Jim: Dude, that's the gayest thing I've ever heard
Bobby: No man, boofing is rad. My
girlfriend boofed an entire gram of MDMA
last night and she was lit.