I. gunk 1 /ɡʌŋk/ BrE AmE noun [uncountable] American English informal
[ Date: 1900-2000 ; Origin: Gunk , a trademark for a type of soap ]
any substance that is dirty, sticky, or unpleasant SYN gunge British English
—gunky adjective
II. gunk 2 BrE AmE verb
be gunked up (with something) American English informal to be blocked with a dirty sticky substance:
Here’s your problem. The fuel line’s all gunked up.