beat one's meat
Definition from Wiktionary, the free dictionary
- (idiomatic, vulgar, of a male) To masturbate.
1948, Psychiatric quarterly (New York State Dept. of Mental Hygiene), volume 22, page 243:
- I beat my meat instead of having intercourse.
- (idiomatic, vulgar, by extension) To waste time; to engage in an unproductive activity.