When the bottoms of one's bare feet become black due to walking on dirt or asphalt like a bare-foot bum at a gas station.
Shelly has jiffy feet because she was walking bare-foot.

Whoa, nigga...you gots some nasty ass jiffy feet!
by Matt C. April 5, 2005
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Dirty bottoms of the feet, as if one walked barefoot from the trailer park, up to the jiffy mart (or other convenience store) to buy a 40, discount smokes, and / or a scratch-off ticket. One of the most common situations in which Jiffy Mart Feet can be observed is that of adult film actresses appearing in amateur and very-low-budget pseudo-professional adult film productions.
She was delivering a quality performance riding cowgirl, but then he rolled her over on her back and into the pinned missionary position. This action revealed that she had a serious case of Jiffy Mart Feet which - against the back drop of Busch Light Draft and an overflowing ashtray on the night stand and that crappy wall paper that they only put in single wides - gave the actress a real sense of authenticity in the scene.
by Kid Brooks August 11, 2019
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