River Rat Share definition Flag Defined by Cheravians as, a derogatory term for anyone who hails from across the Great Pee Dee River. ex. Wallace, or Bennettsville, S.C. Look look!! It's a pack of River Rats River Rat by TorcherSapyro May 15, 2005 0 0 Get merch Get the River Rat mug. Buy Now — $32.95 See more merch