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1.
Contraction of Ok, thanks, bye.
Used when you want someone to shut up (you're not exactly trying to be polite,) yet it's not considered as an insult like STFU. Also it can be used when answering a stupid n00b question, or after scolding someone.
I'm not arguing anymore. kthnxbai.
Stop that or I'll ban you. kthnxbai.
^ above isn't as insulting as STFU N00B!
por zirku 08 de Setembro de 2005
 
2.
1) A hasty way to end a conversation.

2) Officially an abbrieviation of 'Ok, thank you, bye.'

3) Most commonly used sarcastically after an insult to try and make it sound jokey (it usually isn't...)
Guy: Hey, d'you remember that guy you pulled last night? You know! The vertically challenged asthmatic one with a glandular disorder?

Girl: Hey, d'you fancy shutting the fuck up now? kthnxbai!

Guy: ...
por CaramelLatte 05 de Abril de 2010
 
3.
to b-slap and walk away
I'm breaking up with you, k thnx bai.
por Natali3 07 de Novembro de 2007
 
4.
something that you say when you kinda want to rush out of a chatroom or when someone won't stfu.
In science class:
"So that's your homework. Go to lunch or whatever."
" KTHNXBAI!"
por alygrl1395 20 de Janeiro de 2009
 
5.
What people say when they have done something wrong on a internet conversation.
Harry: Do you pick your nose?
Frank: WHAT?
Harry: kthnxbai
por Justher 17 de Maio de 2010
 
6.
Contraction of "okay, thank you, bye".

Possibly the stupidest way of trying to end an argument ever. Used by prissy internet douchebags.
"You have no right to come around here and talk to me like that!

kthnxbai!"
por nycto 11 de Maio de 2004