bowser bag noun a container used by restaurants to package unfinished meals to be taken home by diners US,1965 A variation on the more common DOGGYBAG.
Whereupon the child asked, “Father, if you were in a whorehouse and you couldn’t finish, would it be permissible to ask for a bowser bag to take the leftovers home?” — Tom Robbins, AnotherRoadside Attraction, p. 47, 1971