M.C.E. 

A rare species of black organism that solely relies on gum and chocolate to survive. Some M.C.E.s like to view kpop videos.

I saw a wild M.C.E. this morning at school.

M.C.E. by mcemaker093 September 27, 2018

M.I.D.L.F 

Mothers I don’t like to fuck

She’s a M.I.D.l.F. There’s no way I’d fuck her

M.I.D.L.F by Hentai_Supreme1 October 7, 2018

M.A.T.H. 

Mental Abuse To Humans= MATH

Stupid equations ruined ma grade M.A.T.H.

M.A.T.H. by Ƥapi October 10, 2018

M.W 

it means NO MATTER WHAT

i had to tell him M.W

M.W by Xvx.lil November 1, 2018

M.F.B. 

Monogamous Fuck Buddy
Refers to exclusive fuck buddies who aren't in a "relationship" but only fuck each other.

Are not obligated to do couple's activities, except sex.

"Hey, can we just be M.F.B.'s?"
"I'm her M.F.B."

M.F.B. by ak215 November 13, 2018

M.O.S

Stands for "Manual Orifice Sex". Describes when a man manually cuts a hole in someone and sticks his cock into the hole. This is the fastest way to get HIV.

Guy 1: "Hey dude, did you here about the one guy who killed that girl by M.O.S?"
Guy 2: "No dude I didn't, that is sick."
Guy 1: "Yah well at least he got HIV."

M.O.S by CommanderEarlRaymondKingston December 20, 2018

M&M 

M&M Gaming
Short for Mac and Mobile, people who identify as Mac and Mobile gamers are truly the future of competitive eSport gaming, the pinnacle of play.

I cannot afford a console, so I M&M game.

M&M by Jakhammer_1 December 30, 2018