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Literally, Black Chanks on Heroin. Often used in times of rejoicement or anguish to signify happiness or pain.
Ex. 1: Yo, look at that BC on H.
Ex. 2: Yo, I'm smacked as a BC on H.
Ex. 3: Yo, I failed that test like a BC on H.
Ex. 4: BC's ON H!!!
by John Joggers May 06, 2005
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2
EHEHEHEHHEHEHEEHEHEHEEH BLACK CHANKS GUYZ HAY GUYZ HAY GUYZ BLAACK CHAAANKS EHEHEHEHHEHEHE.

yeaa shut the fuck up.
sajghagh; laksf;laskjga lsakjglasgkj;
by your fucking owner May 09, 2005
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