A man or woman involved in sale of illegal narcotics. What differentiates a 'pusherman' from a 'drug dealer' is that the 'pusherman' in notorious for loose morals, poor quality intoxicants and/or unfair prices.
Usually the pusherman is a last resort in the search of prohibited substances.
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'Pusherman' by Curtis Mayfield.
Want some coke? Have some weed. I'm the Pusherman.