"k." is the ultimate passive agressive machine, it is used as a replacement for "ok" because, lets be honest, who has the time to spell "Ok"?
Raise your hand if you do.
Thats right, none of you raised your hands, end of discussion.
XX_LegitSoundingContactNameHere_XX: yo dude you are now our overlord.
Dude is typing...
Dude: k.
XX_LegitDefinitionHere_XX
XX_LegitSoundingNameHere_XX:Off me plz
XX_LegitSoundingNameHere2_XX:No