What is D-slap?
1.
When you take your cock and slap it against some bitch's cheek. Also known as a Mushroom Slap.
Yo, that bitch be tripping, I'ma straight d-slap her back to the hoe-age.
2.
the act of taking one's (yours or a friend's) penis and slapping another (does't matter who) in the face with it. Often people d-slap someone who has passed out drunk or is just asleep.
"don't make me d-slap you"
"dude just d-slap em"
See