gunk

Short definition from Wiktionary

Noun

1. 1
   Grime, dirt, slime; any vague, messy, or unknown substance.
2. 2
   A subculture of 21st century American males, combining elements of modern gothic culture with punk rock.
3. 3
   A member of the gunk subculture.

Verb

1. 1
   To soil or make dirty.