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.
by BenZei December 04, 2005
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)
by word dropper November 11, 2009