To smoke the very last of a cigarette.
Come on, blow the butt of that cig so we can get out of here.
by madison7667 May 13, 2004
The act of farting out a pile of turds, as in opening the floodgates of diarrhea.
"If we don't get home soon, I'm gonna blow a butt in the car."
by mangus May 14, 2004