stick in the mud
See also: stick-in-the-mud
- (idiomatic, derogatory) A person unwilling to participate in activities; a curmudgeon or party pooper.
- Have a little fun sometimes and don't be such a stick-in-the-mud.
- (idiomatic, derogatory) More generally, one who is slow, old-fashioned, or unprogressive; an old fogey.