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Abbreviation for "Go suck your own cock!" An exclamation of exasperation, usually uttered when you want to finish a never ending argument. Inviting your nemesis to perform fellatio on himself, which for 99% of males is physically impossible, is a sure way to A) close a conversation, B) add to your nemesis' anger, and C) confuse him, esp. if you are both male, both straight and never demanded that you suck him off in the first place.
Mike: How about that G8 summit, they say they are going to reduce greenhouse gas emissions by 2020...

Bill: those bloody politicians! they personally create more greenhouse gases then a city block full of apartment buildings, what with their big cars, their private jets and so on...

Mike: GSYOC!!!!

Bill: WTF???? *visibly confused*
GSYOC by pmbear August 5, 2008

gshocking 

it is a verb for when one is wearing their g shock
DAMN! If i was gshocking i'd know what time it was!
gshocking by actlikeuknw January 17, 2011
A term of endearment for your homies and cronies. What up gsmack? Nuthin much Jeeves! We be just gsmackin around the way in our ridez yo. It can also be a verb and a state of being. Just gsmack back a little and chillz da fruck out.
Me and my gsmack are rollin and coast locin', listenin to some beats.
GSmack by shellackin25 November 9, 2013
N: the act of buying an engagement ring for your girlfriend, signaling the end of bachelorhood.
I heard that Jimmy committed gemocide with his girlfriend the other day.
to smoke marijuana with another person whilst communicating through video on Gchat
That's okay, cracka, cause we can Gsmoke.
Gsmoke by Donovan Snow February 23, 2011
n, The systematic and planned extermination of emo kids.
Hey dude, at the Dashboard Confessional show, let's commit gemocide!
Gemocide by Tim Sath June 11, 2006