M guy Share definition Flag An “M guy” is a immediate good sign in dating. Men with names beginning with the letter M are known to be cool, charismatic, attractive, and compassionate. “I was talking to Michael before, I might ask him out on a date” “Well he is an M guy overall” M guy by maracas_ December 28, 2020 0 0 Get merch Get the M guy mug. Buy Now — $32.95 See more merch