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1.
Variation of 'kthxbye' - the internet bastardization of "OK, thank you, goodbye".

Generally used with contempt, or for hasty exit. See also - kthxbye
n00b: Hey man whats up? You going out tonight?

l337: Yeah I'm on the way to the club right now kthxbai
by #1 October 25, 2003
 
2.
Okay, thank you, goodbye.
Could you please boot that n00b from the server? kthxbai
by squidblaine May 09, 2004
 
3.
Bye in "lolcat speak".
i can has cheezburger? kthxbai.
by allvanishing November 25, 2007
 
4.
K Thanks goodbye

kthxbai can also be used as an insult to someone, like a n00b or someone you just don't like.
N00b1: omg liek u wana c my fab nu jurnal?
Dude: No, you make me sick n00b Kthxbai
by Gabe Hall June 25, 2005
 
5.
Literally "Okay, thanks, bye". Commonly used when short words and phrases are needed, as in when chatting and texting. Can also be used to quickly end a conversation, usually in a rude fashion.
Jane: "Hai John! Sup?"

John: "Nm, gtg, kthxbai."

or

Jane: "Hey John, why won't you talk to me?"

John: "Because. kthxbai."
by avengergirl May 14, 2010
 
6.
'Kay, thanks, bye.
(Okay, thank you, goodbye.)
A hasty way to tell someone goodbye, especially if you dont' want to talk to them. Also see kthxbye.
Person1: Oh, yeah, you're not really my friend. Kthxbai. *leaves*
Person2: *facepalm*
by your mother.. May 29, 2010
 
7.
k thanks bye
"nobody loves you, so why don't you just die, kthxbai"
by Santa April 13, 2003