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Noun: When a woman's legs possess so much fat and cellulite that it hangs over her knee. The resulting roll of fat is a gunk 'um.
Damn buh, have you seen how fat Brina got lately. She got gunk 'ums now and everything.
by BenZei December 04, 2005
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The fat build up in between the thighs that rub (Also could be arm GUNK-UMS: The build up of fat on the side of the arm closest to the armpit)
I need to put vasaline between my legs because I get brush-burn on my GUNK-UMS!!!!
by word dropper November 11, 2009
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