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Term given to the environmental phenomenon occurring at Oak Street Beach in Chicago, Illinois where at sunset the non-black beach patrons leave and are quickly replaced by black beach goers. The transition is subtle and, yet, profound. Occurs almost within 10 minutes of sunset with surprising accuracy.
The flip: "It's getting near 7pm and the sun's about to set, we should probably get going home"

Trojan: "Yeah, I've noticed the sundowning already"

The flip: "dude, the sun hasn't set yet"

Trojan: "I know, but its already getting a little dark outside"
by daledavis September 06, 2010
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