Pronounced gee kee soy kee, it stands for go kill yourself or i'll kill you.
Pretty much can only be used amongst a group of about 5 people in WA, but if used among them they will know what it means and respond accordingly.
fmff: dude, im so good i have a car n stuff
fatom: *somehow says* >.< *in words*
fated: man im a loser and fat
skill: seriously, all of you should gkysoiky.
rest of people: okay
one of the best/worst abreviations ever. can be said gee-kee-soiky, or g-k-y-s-o-i-k-y. it stands for go kill urself or ill kill you... pretty ownage eh.
Person 1: hey dude i guess i am a complete loser, did u know i have a bout as many friends as a rock
Person 2: really well then gkysoiky
Person 1: damn i just got served... 2 times
Gkysoiky means go kill yuorself or i'll kill you, it what you say if your cool, and you want to be even cooler. Basically its a comeback, but you can say it over the phone and stuff aswell.
person a: hey man your pretty damn fat
person b: ow, just kidding, thats crap! go die in a fire
person a: lol, i will, but not until you gkysoiky!
person b: wtf...oh crap! *dies*