dank slap 

When a person pours soda on the back of a person's head to make the hair sticky (like dank mj) and then slaps them in the back of the head and yells "dank!" in a deep voice.

I was pissed that Danny wouldn't let me play his video game so I dank slapped him.

dank slap by Jeff Weinberg July 5, 2005

Dankslap 

Dank is shorthand for something good.

Slap in this case is an affectionate pat as one would see a baseball coach apply to the rear end of a player when they complete a good play. The two together is now a Dankslap.

Some people see a Dankslap as an attempt to touch another person’s behind while hiding behind some type of celebration or support display when a person needs encouragement.

To express your support either positive or negative wait till the person is walking past you and then wind up and apply either a single - almost too hard yet arguably not hostile slap or a couple soft, quick pats to a person’s rear end while offering words of support - words are particularly important in order to establish you are trying to show support versus just copping a feel.

Hey man, you were a little aggressive with that Dankslap.

“Hey Fred, I prefer you don’t play with my emotions with your Dankslapping”

Dankslap by ProtoHuman July 2, 2022