gunk /ɡʌŋk/noun 4verb 1forms 3phrases 1 noun4 •(informal) Grime, dirt, slime; any vague, messy, or unknown substance.I washed all the gunk off the light fixture, and found that it was white, not brown. •An entity with no atomic parts; infinitely divisible. •A subculture of 21st century American males, combining elements of modern gothic culture with punk rock. •A member of the gunk subculture. verb1 •To soil or make dirty. formsgunked · gunking · gunks Phrases with gunk gunk upTo soil or dirty; to mess up; to clog.