To slap a girl in one of many places(such as the ass, titties, clit, and face(or tongue) just to name a few favorites) with your dick. (D.S. for stealth use)
"I would like to give that girl the dick slap to the face."
Made by a mentally challenged male post pubescent when they take off all their clothes and someone offers to buy them a Super Hero costume causing retard excitement in which the subject repeatedly jumps up and down smacking their dick on their stomach, balls, and legs. The sound created is a Dick Slap.
I can't believe our math teacher gave us homework over Christmas vacation. He's such a dick slap!