n. any nasty, messy stuff. : Get this gunk up off the floor before it dries.
n. glue sniffed as a drug. (Drugs.) : I thought that it was illegal to sell gunk.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
gunk
1949, "viscous substance," Amer.Eng., apparently from Gunk, trademark for a thick liquid soap patented 1932 by A.F. Curran Co. of Malden, Mass.