bamf

Acronym of bad-ass motherfucker, a very tough or formidably impressive person who is not to be trifled with.

And -atttitude-^([sic]) is a big part of being a BAMF, too.

Yarborough took a beat, recovered a little, got back to being a BAMF. Telepath couldn't put him down, he boasted. He hadn't met the freak that could.

Signalling a user's disappearance from a discussion, chat room, etc.