mo 

Short for Moustache.
Esp. a ridiculous one...like wassisname from The Darkness/Paul Thompson from Franz Ferdinand

ehehehehehe! He's got a pimp mo!

mo by Pretty Vacant May 17, 2004

Mo 

A special kind of guy who embodies awesomeness but can sometimes be a tough cookie. looks meh with glasses on but is confident enough to not give a fuck. Loves Manchester United. If he could marry it he would (no homo). Uber social with more friends than he can count. The only Egyptian guy I've ever come across who's a revolution pussy. Aims derogatory terms to ones he's sexually attracted to. Shows affection by calling them bitches which even if you tell him it annoys the shit out of you, to him it just goes unregistered. On rare occasions he'll say something sweet and when he does, he will surely melt your heart! But it's always short-lived. The most innocent little bunny ever! And the best online friend a girl can ever ask for.

Friend 1: omg who is that hottie over there? I like his swag!

Friend 2: oh ya that's just Mo my hommie :)

Friend 1: give me a piece of that ass.

Friend 2: be careful with him or you'll get burned. He's highly flammable.

Mo by VideoVixen January 27, 2013

Mo 

To get really bad head, specifically including a lot of teeth.

Man, I got moed last nighi, I think there may be scars.

Dude, don't go with her. she'll mo you.

It was her first time giving me a blow job, so I didn't have the balls to tell her she moed me.

Mo by Ta Mir May 2, 2010

Mo 

*rolling eye emoji*

Rolls my eyes at Mo

Mo by #can't say May 22, 2018

Mo 

Short for Molybdenum, has an atomic number of 42, (the true meaning of life, the universe, and everything according to Deep Thought, the computer from The Hitchhikers Guide to the Galaxy).

Oh, Mo, what would I do without you?

Mo by m0llyBd3nim42 August 11, 2018

mo 

A mo is a certified time period that states no specific time length.

Player 1: I'll be on in a mo.
Player 2: Okedoke!

mo by Pugzli April 21, 2019

Mo 

A person who is weird, an, asshole or straight up gay also a short abbreviation for homo

Tim: if you drink motor oil can you die Jimmy : yes you fucking mo Kenny : Gabriella likes girls Frank : yeah I knew she was a mo Michelle: fuck you you Mexican asshole Santana shut the fuck up you fucking mo

Mo by Deke In your ass June 27, 2019