A traditional sink that is converted into a cooler by closing the drain and filling it with ice and water. Generally found in poor neighborhoods which lack proper coolers.
Yo somebody get me a '40 outta the nigger sink!
by John Harvey Jr. August 19, 2008
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Nigger sink is the actual name for a geological formation that dates to the Late Paleogene.

Ref: Florida state Geological survey
guy 1: I earned a degree in geology and studied nigger sink
Guy 2: What does commiting a genocide by draining a race down the sink have to do with geology?
Guy: Its just the name of the formation
by greyideas get edgy January 10, 2021
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