MOS

Okay, everybody else's definition of MOS is wrong. They are all stupid. Here is the real explanation: When a man loves a woman very very very much, they engage in an act called M. O. S. MOS stands for Mutual Oral Sex and is extremely pleasurable. Also see 69, Something that is awesome, the shit, the awesome, the best thing ever, etc.

Jennifer: Hey Austin, wanna MOS?

Austin: I like men.

Jennifer: Oh.

Jennifer: You don't know what MOS is, do you?

Austin: No. *Looks sad*

by International Lesbian Actor, George Clinton September 18, 2006

MO

Short for MOFO, which is short for Mother F'er... Used when somebody is being extremely MOFO-ic, and think they're a bad aaah from the skreets.

What up NuggA?
Aww BiT.. You just a MO!

by Jena March 16, 2005

mo

Short for 'moron'

That guy talking into an N-Gage looks like a mo.

by 1337 h4x0r November 20, 2003

mo

Someone or something that sucks, is annoying, or is frustrating. See also moped.

You told my boyfriend I hate him? You're such a mo!

Guy 1 : I just lost my job.
Guy 2 : What a mo.

by debbi domination November 5, 2008

MO

When someone is taught something and deliberately does it there own way in spite. This often leads to disaster.

Don't pull a Mo dude.

by Shydog October 16, 2008

Mo

Derived from the term "Homo" or "Homosexual" whereas the "Ho" beginning is used to describe the woman in a relationship with the gay man, subsequently named the "Mo"

Angela is the ho, and Sean is the mo.

by eugaet January 26, 2010

Mo mo

: an ugly witchy molestor- male or female - typically of the pedophile type

"Yeah my great aunt and uncle are both mo mo's" 😒

by opaltime June 22, 2015