gunk

Etymology

Apparently from Gunk, trademark name for a liquid soap; perhaps taken as a blend of grime + funk.

noun

1. (uncountable, informal) Dirt or grime; any vague, messy, or unknown substance.
   I washed all the gunk off the light fixture, and found that it was white, not brown.
   Don't get gunk on me. I took a bath last Saturday and I'm all clean. May 18 1989, Bill Watterson, Calvin & Hobbes (comic)
2. (uncountable) A subculture of 21st century American males, combining elements of modern gothic culture with punk rock.
3. (countable) A member of the gunk subculture.

verb

1. To soil or make dirty