Slap Johnson 

a black man joke between white people while playing Halo/
slapping somebody with your dick, or slapping your own dick with your hand.

"Slap My Johnson"
"iam gona slap your johnson"

Slap Johnson by Cursive March 5, 2005

johnson slap 

slapping some one in the face with your penis

I johnson slaped that ho

johnson slap by jizzo_joe December 14, 2005