This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Informal A thick greasy substance.

n. dirt or grime; any vague or unknown substance

n. A subculture of 21st century American males, combining elements of modern gothic culture with punk rock.

n. A member of the gunk subculture.

n. any thick gooey and messy substance.

n. any thick, viscous matter

"Meanwhile, the brownish-blackish gunk is drifting along the coast to the northeast, Brower said."

matter   

sapropel   

degunking    gunk up   

goo    gook    guck    muck    ooze    sludge    slime    gunge    goop   

glop    ppt    greenjuice    flamy    rockfish    calamari    politican    sandstone    pumice-stone    elderling