beat one’s meat

beat (one's) meat

vulgar slang To masturbate. A term only applied to males. A: "Why is he all embarrassed today?" B: "Oh, his crush walked in on him beating his meat. How horrifying is that?"
See also: beat, meat
Farlex Dictionary of Idioms.

beat one’s meat

verb
See beat the dummy
See also: beat, meat
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • beat (one's) meat
  • beat the meat
  • beat your meat
  • beat the bishop
  • beat the dummy
  • pud
  • beat the pup
  • fap it
  • pound (one's) meat
  • pound one’s meat