Humorous phrase used to typically describe someone who enjoys lifting up
the shirt of a shirt-wearer. Usually used to describe a
homosexual man who does indeed lift up
the shirt of a guy just before slipping his penis up the rectum of said guy, or just before taking another man's organ into his mouth.
E.g A man drops his pants to reveal his member, but just before receiving a gobble from the gobbler his shirt would need to be lifted up, or even better removed entirely.