Slush Flap 

The build up of snow, slush, ice, sand and road salt behind wheels of a vehicle in the winter.

Guy1: I think I busted my toe.

Guy2: How did you do that?

Guy1: I was trying to kick the slush flap off my car and it was frozen solid.

Slush Flap by Random Anonymous Blackmail April 9, 2012

Slashflaps 

BIG Pissflaps. Usually funny looking

You have large slashflaps, Yo!

Slashflaps by Dingleberry January 7, 2005