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1.
1. An even FURTHER bastardization of kbye and kbi. An abrupt way to end a conversation. Usually used in online forums and in instant messengers.
2. To die. To expire. To cease to exist. To push up daisies. To buy the farm. To kick the bucket. etc...
1.

n00b: n den he wuz all liek ROFLLOLOLOLOLROFLROFLROFL!!!!11`
Jill: kbai. *signs off*

2.

sad emo kid: LIFE JUST ISN'T WORTH IT ANYMORE!!! *sob sob sob* (grabs razor)
nerdy internet kid: *busts in* No go kbai! Want to go get tacos?
sad emo kid: okay.
by Gilmo August 30, 2006