1. slang Any unpleasant residue or matter. The word originated as a trademark name for a degreasing solution. You're gonna need a more powerful cleaner to get that gunk off the sides of the tub.I was just working on my car, so I need to wash this gunk off my hands.
2. slang A glue or aerosol that one inhales in order to become high. Gunk is dangerous stuff, you know.
gunk
(gəŋk)
1. n. any nasty, messy stuff. Get this gunk up off the floor before it dries.
2. n. glue sniffed as a drug. (Drugs.) I thought that it was illegal to sell gunk.