Kthx
kthx definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "kthx" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Kthx is a quick way of saying "okay, thanks." You're most likely to encounter this abbreviation in text or chat messages sent by a grateful friend or family member. For example, if you agree to watch your friend's dog for a day, they may reply with "Kthx, I really appreciate it!"
Kthx is a combination of the common k and thx abbreviations. It can be further extended to kthxbai, which means "okay, thanks, bye."