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A Pokemon that is full of poisonous gases and spews them out in battle.
Jessie; Go Ekans

James; Go Koffing
Koffing by Light Joker April 25, 2004
Related Words
The act of kempfing is to pump a girl full of diesel during 5 second intercourse then to also disperse the diesel upon the girls stomach or chest if possible. People that kempf usually are attracted to "filling up" girls with the first name Kailyn, Shawna, and Faye. Also the only way to be endowed with diesel flowing through your small penis is to be obsessed with diesel, trucks, or cranes.
Kailyn - Last night got weird I was riding Joe then he went inside me.
Chris - What's weird about that?
Kailyn - Just that black stuff drained out of my vagina and it smelled like diesel.
Chris - That's a classic case of kempfing.
The most unexpecting thing to yell out in a group conversation
guy1: so how you guys doing?
guy2: good, but anyways how about that Sally bitch eh?
guy3: shes a bitch, i totally wanna--
guy4: KOFFING!
KOFFING by Galano March 24, 2005
*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
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
The best thing ever.
Koffing gassed the Jews, everyone loves Koffing!
Koffing by Jshadias April 10, 2004