grime

Short definition from Wiktionary

Noun

1. 1
   Dirt, grease, soot, etc. that is ingrained and difficult to remove.
2. 2
   A genre of urban music that emerged in London, England, in the early 2000s, primarily a development of UK garage, dancehall, and hip hop.

Verb

1. 1
   To begrime; to cake with dirt.

Proper noun

1. 1
   A surname from Old Norse.