/grunj/ , n. Slang.
1. dirt; filth; rubbish.
2. something of inferior quality; trash: He didn't know good music from grunge.
3. a person who works hard, usually for meager rewards; grind.
4. a style or fashion derived from a movement in rock music: in fashion characterized by unkempt clothing and in music by aggressive, nihilistic songs.
[ 1960-65; expressive coinage, perh. reflecting GRIME and SLUDGE; sense "grind" perh. by assoc. with DRUDGE ]