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!
by Pretty Vacant May 17, 2004
Mo
When used in north eastern New Jersey/New York "Mo" generally stands for "Moron".
"My dad is such a mo. He got arrested for assaulting an officer again."
by LK865 November 18, 2011
mo
1. short for mom, specifically used to talk trash about someones mom when you're so fucked up your words are slurred so you just take the lazy way out.

2. short for more in the same instance, usually referring to more of whatever substance has gotten you so fucked up
1. "Yo i just banged your mo last week."

2. "Give me some mo"
by Yigstein's Money February 17, 2011
mo
verb, "to do a mo", to fail at ones objectives - referencing Mo the bartender in popular cartoon sitcom "The Simpsons"
guy 1: hows your coursework going dude?

guy 2: I quit university...

guy 1: What with only 6 months left to go??? You doing a mo man
by warblings December 05, 2010
Mo
Missed oppurtunity usually in regard to an attractive male or female that you could have hooked up with.
"Did you see that girl?"

"Yeah man, total MO
by Amanda0311 September 29, 2010
mo
A loud, obnoxious person who is both weird and annoying, talks as if he is a mile away from people. Also slang for homo.
-Wow he is pullin a mo...

Damn dude your ears must hurt
by Tommy Mo May 27, 2010
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.
by Ta Mir May 02, 2010

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