Cab Rat

"Cab Rat" The lowest of the low, a driver who makes a mess in the cab of your truck or any truck for that matter and refuses to clean it after they have used it.

Dave keeps his truck spotless inside and out, he has just arrived at the yard to pick up his truck for the week to find that Tim has used it for a nightshift and left it looking like a skip.
Dave "Tim, you dirty f*****g cab rat"