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

mo by warblings December 5, 2010

Mo 

Short for "mother" or "mother fucker" used to show exajuration. (spelling?)

"MY TOE HURTS LIKE A MO ON HER BIRTH DAY!!!!"

"Duuudee"

Mo by jake February 7, 2005

mo 

could mean anything. Usually used in a sentence as "You are mo" or "I feel mo" which can mean "You are gay" or "I feel strange".

I'm feeling pretty mo today.

mo by blokzberry July 11, 2006

Mo 

A Mo is a codename for a morbidly obese person.

X: Hey check out that shit
Y: Yeah, thats one hell of a mo.

Mo by Mr. Twango April 4, 2011

mo 

a girl that is not extraordinarily hot but not completely unfortunate. if you're pretty bored one night, she'll do.

"Dude! that chick is hot!"
"Eh, she's mo."

mo by lani December 30, 2002

mo 

a big whore- or ho

that mo sucks a mean dick

mo by your mom May 1, 2004

MO 

A Male HO or a guy who sleeps around with anything with legs, most likely for either personal gain or as a recreational sport

"Dang, that guy is a MO fo sho!"

MO by snookie007 August 18, 2009