A term used when upon entry into a party, a subtstantial amount of black people are seen within its limits.

(Also works some bullshit within the brain.)
There was mad substantia nigra last night, those bitches must have been looking to get bukkaked by the best of 'em.
by Sean "Droke" Hirst February 09, 2006
Get the mug
Get a substantia nigra mug for your bunkmate Beatrix.