Noun. A plastic bag (usually from a grocery store, bodega or other ghetto-mart) that has been inflated and borne aloft by the wind, giving it a jellyfish like appearance. Common in neighborhoods where littering is acceptable but walking on a sidewalk isn't.
I almost ran over that ho because she stepped out infront of me right as an urban jellyfish splatted up against my windshield.
by hoodrat January 4, 2005
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A used condom discarded within an urban setting such as a busy street or project courtyard.
Ahhh shit, the other day I slipped on an urban jellyfish lying on my stoop and almost wrecked my new dunks. Then later I seen my two pit-bulls playing tug-o-war with the same jellyfish and it snapped, the jiz was all over their face.
by John Ryan April 3, 2006
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Small (or large) patches of spittle on the pavement.
Careful baby, don't step on that urban jellyfish, you don't know where it's been.
by R. Angus March 20, 2008
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