noun
gunk
GUNK/ɡʌŋk/
A sticky, dirty, or unpleasant substance.
Thick gunk clogs the drain strainer and sticks to the ceramic surface.

Etymology
Gunk apparently comes from the trademark for a thick liquid soap. The product name became a general term for viscous, dirty, or unpleasant material.
In context
wash your hands gamers you don't want to get gamer gunk all over your mouth
More examples
- I scrub the gunk off the stove.
- This old lotion leaves greasy gunk on my hands.
- The mechanic clears gunk from the clogged fuel line.
Forms
gunk
gunky adjective — Covered with sticky or unpleasant material.