Top Definition
a foul city odor that becomes more pungent and intense during the summertime, when the heat index is high.

most often occurs in east-coast cities, such as philadelphia, when the combination of exhaust, fumes, sewage, trash, are all wafting up your nasal passages, already moistened with the wet lube of humidity.
man, i was hoping that thunderstorm we just had would bring the humidity down, but now it just smells like street diaper!!!
by earthcrunch July 10, 2011

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