a guy thing

a guy thing

slang Something that is said to be done or understood primarily by men. A: "Is being late just a guy thing?" B: "No, your boyfriend's rude." It's a guy thing, Claire—you wouldn't understand.
See also: guy, thing
Farlex Dictionary of Idioms.

guy thing

n. something that appeals to men; something that men do. We just do it. We don’t know why. It’s a guy thing.
See also: guy, thing
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • guy thing
  • girl thing/guy thing
  • penny for the guy
  • remember, remember, the fifth of November
  • Mr Nice Guy
  • Mr. Nice Guy
  • big guy
  • crackbrain
  • a line on (someone or something)