Stands for "it's okay". It basically means "you're welcome". Often used in reply (via messenger, email etc.) to "thank you".
John: Oh I found the address of that website you wanted.
John: 'ts kay.
Lisa: I've got that book you lent me the other day; I'll give it to you at school tomorrow.
Lisa: 'ts kay.
A polite acronym for "couldn't be arsed."
Synonyms: "tough," "tough shit," "I guess you're SOL," "couldn't care less."
1. Mel: "Are you going to sew your own costumes or buy them readymade for the Twilight party?"
Using myspace slang makes me look scene!
I don't care what you think... STFU (shut the fuck up)
Don't add me if you're not going to comment me.kthnxbye. (kay thanks bye)
don't talk to me in flippy caps (LyK DyS)
I'm good, hbu (how bout you)
I heart you, I <3 you (casual way of saying "I love you")
note: multiple 3's can be used for added effect (<3333) or <321, <3456789, <1+2, etc.
Your hair is the sex (very cool)
tha'ts uber cool. (very)