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The Underground Gay Mafia. It is a secret network of gay men who have all slept with each other. It's similar to the Six Degrees of Seperation of Kevin Bacon.
"I slept with Clayton."
"How?"
"The UGM. I slept with Nick who boinked Matt who banged Clayton... sideways."
UGM by UNI_whore December 14, 2009
Related Words
ugmo ugmfu ugm ugmug ugmar Ugmart Ugmazing ugmdotf UGMGL ugmoe
UGM means YOU GET MOUTH for the nigerian fresh kids. it's usually used when someone is being praised for a reasonable and unique achievement
hodge: p.k you made a very good result, congrats

p.k: i thank God

hodge: mehn p.k *UGM*
ugm by slimsparrow October 7, 2010
An acronym meaning "U Got Me Fucked Up"
Made popular by Mike Khoury
" My bitch leave me on read? UMGFU."
"Mom say clean the dishes? UGMFU."
" somebody got u fucked up? Just UGMFU They ass."
UGMFU by DRiNK WATER//Mike Khoury September 18, 2017
Ugmo -noun
pl-ugmos

An ugly monster. Lisa Simpson once said it.
Jen:

"some of them are gorgeous, some of them are plain, a few are ugmos"

Or, from The Simpsons:

Lisa: I'm an ugmo.
Homer: Now, that's not true. You're cute as a bug's ear.
Lisa: Fathers have to say that little stuff.
Homer: Dad, am I cute as a bug's ear?
Grandpa: No. You're homely as a mule's butt.
Homer: There. See?
ugmo by Thomas D April 16, 2006
a relatively unattractive female considered hideous to even people with virtually no standards.
WILHELM: do you guys think my girlfriend vera is hot?

COLIN: you mean that hideous goblin over there?

CARL: dude, calling her a goblin is flattering, shes a fucking ugmo!
ugmo by ronnie_e July 30, 2010
Ugmosis

Ug-mo-sis (Uhg-moh-sis)

-noun

1. A tendency of ugliness to pass from one friend to another.

2. A subtle or gradual absorption or mingling of one friend's poor looks to another through association.
"I thought she was hot until her friend showed up and ugmosis set in."
Ugmosis by J Mazon May 13, 2010