Working his butt off - Idioms by The Free Dictionary
work (one's) butt off (redirected from working his butt off)
work (one's) butt off
To work really hard (on or at something). I know you thought it was just a silly New Year's resolution, but I've been working my butt off at the gym! Sally and Jim work their butts off when we hold our user conference—I don't know what I'd do without them!
References in periodicals archive
As mates, we knew that Brett was desperate to play and was working his butt off
and I honestly believe that turned his career around.
He's working his butt off
because he wants to prove he belongs out here.
Scotty's been working his butt off
,'' said leadoff hitter David Eckstein, who had four hits and reached base five times in six plate appearances.