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1.
noun - An abbreviation of Grandmother.
James: "Yo, dog, I saw my G'Mo yesterday. That bitch gave me money and cookies."
Bob: "My G'Mo's a babe.

Kristian: "My G'Mo was looking over at my emails."
Zach: "She be a creepy bitch."
by Casper360 December 22, 2013
 
2.
gmo
n. 1. genetically modified orgasm. 2. to have a fake orgasm.
"I just found out my girlfriend has been GMOing on me."

"Jenna Jameson is the queen of GMOing."
by mic dundee June 24, 2007
 
3.
gmo
an emo that is gangster aswell
omg hannah your so gmo
by vorny January 10, 2008
 
4.
GMO
Acronym for "Genetically Modified Organism" used to identify someone that is too cool/smart/sponcho/weird to be a real human. Entity/supernatural being who could have been originated only through genetic engineering techniques.
A - damn,look at that chick..she's so hoooot!!
B - yaaaa...she's GMO!!!

A - ..that guy's arrived ONLY 10min ago and he's having his 6th Jack!!
B - wow..maybe he's GMO;)

A - have you heard about the last Bolt's world record?
B - sure...he's too GMO!!!
by yosoybeachboy November 06, 2009
 
5.
GMO
gay meth orgy
A 4 day drug fueled homosexual gang bang, gay meth orgy or GMO
by bkkripper April 15, 2011
 
6.
A person who is an emo, but thinks he is a gansta (notice the hip-hop spelling) .. G-mo's wear 'Nu-Era' hats and they keep the sticker on to look cool, which they are not. they walk around thinking everybody likes them. which they also do not.
Tim: Im Gansta
Kayla: Shrup fool
Tim: that aint gansta. me and will are G
Will: Well Good!
Jack: oh bloody hell shut up jew nose
Tim: shush nigger nose
Jack: im G Aswell
Tim: No your H
Kayla and jack: G-MO!
by jackinory May 28, 2007
 
7.
emo (emotional) and gay (homosexual)
to the ex girlfriend: "Yo! You said you were seeing someone else and i was kinda jealous,but that was before I knew he was g mo! Later
by upincanada November 06, 2006