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!
Literally means, "Okay, thanks, bye" Usually said to be a bit more sarcastic and rude when trying to make a point. Used to end a conversation/point quickly.
I understand. Your help in this matter has been greatly appreciated. However, with much regret and much haste, I must be departing from our conversation.
newb2342: da partiez @ 4, b there!!1
lolz3r: kthxbi!!!!11