Top Definition
When an African American male or female urinates on the chest of another human, and it runs down their body like a river.
"OMG Stacey, I finally got to see that black river everyone's talking about."

"Was it worth it?"

"Was completely warm and comforting like everyone said it would be!"
by Big naughty Santa November 14, 2014
2 Words related to Black River

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