M/O

Is short for months old.

My baby is 5 m/o.

by Emkiz January 22, 2018

M.A.T.H.

mental abuse to humans

I hate M.A.T.H.

by SW85_YT May 10, 2018

M’Kaegan

A girl who doesn’t have many friends, but she is a very good friend! She gets jealous when people she really likes doesn’t acknowledge her! She is a really good entertainer very funny and dramatic. She loves loyal people and is very loyal.

M’Kaegan is the best friend in the whole wide world.

by theprincessloaf March 24, 2018

M.F.

Acronym for Mother Fucker

Harry: I got caught by my mom jerking off last night
Jason: Why the fuck were you doing that you sick M.F.?

by Sh*tsticks May 19, 2018

M-List Celebrity

Someone famous for running an instagram meme account with more than 1k followers

"My meme account just hit 1k followers, I'm officially an M-List Celebrity now!"

by shadystones666 May 24, 2018

M.A.N. Sauce

M. A. N.

Mayonnaise and nothing.

Typically used on sandwiches

"I 'd like a ton of m.a.n. sauce on my burger."

by Meddo June 4, 2018

M&M's

Medical Marijuana

Did your Doctor hook you up with your M&M's?

by RUserius54 June 4, 2018