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1. Keffing
*British* (participle), verb: to kef
A rather hard slap to the back of the neck.

NOTE: Does not mean, nor does it imply masturbation.
Dude 1: HOLY FUCK, JUSTIN BIEBER!
Dude 2: You deserve a mighty good keffing.
2. keffing
A new word on the streets meaning masturbation over ones own faeces to intoxication...
Boca was keffing over his mother.
by NuKeZ Dec 10, 2004 add a video
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