A subfamily of beta males. Obsessed with cats. Always has cat hair on all their clothes yet they still wear black. Will have iota male traits. Always wants to tell you their what their "baby" cat did today.
by bigdaddylion March 21, 2021
A Mu male is an average male who is just a nobody: in fact, on the sentimental and sexual radar of women, he doesn't even exist. He's that kind of gray, shy, low-key man that has been around in the office for years but who is so insignificant that no one ever remembers his name.
John brought a cake for everybody at the office, but everyone thought it was Susan's for he's such a Mu Male.
by Mrommel August 10, 2021