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1.
An acronym for the phrase "Good luck on killing yourself". This can either be said in a sarcastic or genuinely spiteful way. Or, in some cases, in a friendly, positive way.
Example number one (To be said when seriously upset with another person):

Dave: I made out with your gf last night, Roger.
Roger: gloky.

Example number two (to be said sarcastically):

Roger: Hey, Pamela, would you like to go on a date with my to an anime convention?
Pamela: gloky.

Example number three (To be used with extreme caution.)

Pamela: I hate myself, and I legitimately want to die.
Dirk: gloky!
by Poodler247 July 17, 2008
 
2.
An abbreviation for the phrase "Good Lock on Killing Yourself."
Used for efficiency reasons.
You're bad at life. Gloky.
by CrabCrabCrabCrabCrab July 17, 2008