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*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.
Keffing by Fizzle12345671 February 18, 2011
Related Words
She's funny, creative and a loyal friend. She's naturally quiet but loves to have conversation, yet not a people person. In other words, she's a human contradiction. She loves strongly and hardly ever gives up on anyone or ever holds a grudge. Very mature, though, a child at heart. Very caring and understanding. Will never judge you based on your flaws unless absolutely necessary. She's beautiful inside out and is a rare gem just like her name!
Keffian is such a beautiful name.
keffian by Mickey_J60 July 25, 2018
A new word on the streets meaning masturbation over ones own faeces to intoxication...
Boca was keffing over his mother.
keffing by NuKeZ December 10, 2004
A nickname for your boyfriend or friend who is named Kevin when he is ignoble, or in Swedish "keff".
Keffin by Girls/girls/boys October 14, 2018