Scum Rat Share definition Flag A Scum Rat is a term used to define your typical rat junkie. Usually found covered in rats in some sort of a meth den, and is less important then the scum growing on his crack pipe. scum rat: hey champ spare a coinfather: BACK OFF! ya fucking scum rat Scum Rat by dthenb May 20, 2010 0 0 Get merch Get the Scum Rat mug. Buy Now — $32.95 See more merch