Winston Churchill (British Prime Minister during WWII) ended almost every phonecall with KBO.
KBO is an acronym for "Keep Buggering On"
Winston Churchill: Let's have a drink or two some time after this terrible war is over.
Franklin D. Roosevelt: That would be great fun!
Winston Churchill: Right then, KBO.
by Ulv88 December 09, 2006
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Knock Bitches Out.

Most likely used in game situations for pump-up purposes.
Girl 1: Let's win this game!
Girl 2: KBO?
Girl 1: Hell yeahhh.
by hi9349238432875 October 13, 2010
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