A very tall guy who's name is Matthew. Big-M is a nickname for this very cool guy
person 1: Hey you know Big-M ?
person 2: yeah the drink?
person 1: no you fuckwit, the very kool guy matthew!
Big M is a name for a guy who is the best at everything and who everyone should listen to.
Big M is a player and a fucking hitter
Big M gets all the bitches
a guy that smokes a lot of weed and vapes has a great taste in music
Big E is guy that has a vape pen on him all the time