Nigro-op-oly Share definition Flag When a slave owner owns the majority of the slaved in the market, thus having an economic monopoly. Did you hear about Farmer Josoph's Nigro-op-oly? He's really made a name for himself this year :D Nigro-op-oly by FarmerJosoph September 19, 2009 Get the Nigro-op-oly mug.