A funny prank to play whilst drunk at a party or sleep over. Much like placing cream in the open hand of a passed out or sleeping person and tickling them on the face so they slap cream in their face. This is very similar, only using a different kind of "cream". One masturbates on to a piece of tissue, and places the used tissue dry-side-down on to the victims hand. The victim is then tickled on the face to entice them to scratch to itch, and then end up with a wanky tissue stuck on their face.
Dave: Mate, Simon's out cold.
Frankie: Shit, yeah. Hey, he's got one hand open.
Dave: You thinking what i'm thinking?
Frankie: Hell yeah! Let's wank slap this dude.
Frankie: Shit, yeah. Hey, he's got one hand open.
Dave: You thinking what i'm thinking?
Frankie: Hell yeah! Let's wank slap this dude.
by jewittinspace August 13, 2010
Get the Wank slapmug. by Piss Cheeser August 24, 2009
Get the Wank Slapmug. To Slap someone repeatedly on the forehead/face with your penis while they have passed out at a party.
by Andy Scotland December 7, 2007
Get the wank slapmug.