Source : WordNet®

grunge
     n : the state of being covered with unclean things [syn: {dirt},
          {filth}, {grime}, {soil}, {stain}, {grease}]

Source : Free On-Line Dictionary of Computing

grunge
     
        /gruhnj/ 1. That which is grungy, or that which makes it so.
     
        2. [Cambridge] Code which is inaccessible due to changes in
        other parts of the program.  The preferred term in North
        America is {dead code}.