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.
Synonyms for kthnxbai
On this page, you will find 30 slang terms related to kthnxbai. Some of the top words include: ktnx, kthxbye, KTHXBI, wtf, kthanxbye, and 25 more.