What is Dempski?
1.
to smash, break, wipe out, beat, hurt, etc.
Used mostly by surfers
Surfer 1: I was gettin shacked on that 20-foot monster, and that kook cut me off and made me break my board.
Surfer 2: Dude what'd you do to him?
Surfer 1: I dempskied the kooks board over his motha fuckin' head.
See