Variation of 'kthxbye' - the internet bastardization of "OK, thank you, goodbye".

Generally used with contempt, or for hasty exit. See also - kthxbye

Okay, thank you, goodbye.

K Thanks goodbye

kthxbai can also be used as an insult to someone, like a n00b or someone you just don't like.

Bye in "lolcat speak".

k thanks bye

Okay, thanks, goodbye for people you really don't like. Used as a derogatory term for idiots.

acronym used online for K Thanks Bye