'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*
Something you add to a statement when you know that it really isn't needless to say.
I went to my seven-year-old nephew's birthday party last night. Needless to say, I got wasted.
The kids you had to sit/stand by in grade school because your last names were next to each other in the alphabet.
Yeah, he and I were alphabet buddies in fourth grade.