noun Informal.
any sticky or greasy residue or accumulation: gunk on the oil filter.

1932, Americanism; originally a trademark name for a degreasing solvent Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gunk (ɡʌŋk)
informal slimy, oily, or filthy matter
[C20: perhaps of imitative origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1949, "viscous substance," Amer.Eng., apparently from Gunk, trademark for a thick liquid soap patented 1932 by A.F. Curran Co. of Malden, Mass.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The leaves can gunk up the fan mechanism and snow that turns to ice can cause problems with either rust or expansion.
Food particles and water are spun off as a creamy gunk that he removes with a
The light-killing blackness makes for delicate balances of impenetrable gunk
  and infinite depth.
The increase in pressure expels the water in the mouth cavity and whatever gunk
  may be floating in it.
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