Top Definition
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
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
an emo that is gangster aswell
omg hannah your so gmo
by vorny January 10, 2008
gay meth orgy
A 4 day drug fueled homosexual gang bang, gay meth orgy or GMO
by bkkripper April 15, 2011
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
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
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

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