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To slang horse is the act of selling heroin. The term is commonly used in inner cities.
Example 1: All the rich kids slang horse these days.

Example 2: Guy 1 : I herd Jake was Slangin horse

Guy 2 : What's slanging horse ?

Guy 1 : To sell Heroin
by Fluffglover567 March 14, 2015
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