c-slap 

To use one's penis and slap someone across the face with it. Usually its a girl getting slapped when she sucks the penis improperly.

guy 1: nicole last night gave me a horrible blow job.

guy 2: oh did you c-slap her?

guy 1: yep across the face.

c-slap by little white May 20, 2008

C-Slap 

To cum on your hand and slap someone in the face with it!

Man, if she doesn't shutup, i'm gonna C-Slap her straight across the face.

C-Slap by C-slap that hoe! April 24, 2011

C Slap 

To use a Cock (penis) to slap a person in the face

Don't make me C Slap you!

C Slap by PsL Sean December 13, 2005

C Slap 

Also, to slap someone's cock with one's face. This is derived from Einstein's Theory of General Relativity.

Wait... did she C Slap you? What a bitch! You should give her a White Christmas.

C Slap by Strokes McGee April 26, 2006