Good To Know
Said when people tell you things you don't really care about or want to hear.
Ashley: I'm having my period right now.
Chris: GTK Ashley
its the acronym for " Good to know", it can be used in terms of sarcasm or actuality
Valencia: your face looks odd
Short for "Get the Keg".
Used when someone is about to do something so stupid that you don't even want to remember.
Retard: Dude, I'm gunna light my car on fire!!
McRetard: Ahh god gtk.
good to know
--said when someone say something that is good to know
An acronym for the phrase 'get the kill' meaning to have sex with a certain individual.
Boy 1: Hey bro I'm chilling with my girlfriend tonight!
Boy 2: Sweet man, gtk!
short for Good To Know.
He let me know she had chlamydia via IM and I said "gtk".