Top Definition
When you and/or a bunch of your friends piss/shit, pour bong water, rotten milk, anything nasty into a trashcan and lean it up some unlucky person's front door. You then knock on the door, run away and when they open the door yell "SURF'S UP!!!!"

Variation: Place a Ken doll into the trash can with a flag in it's hand reading "Surf's up!" so that it will pour in the house when the door is opened.
Yo this bitch pee'd in bed so I gave her the surf's up.
by Bitch titties July 27, 2005

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