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Big dope dealer money, he was gettin' some coins
This is a pop culture reference to Troy Sanchez, Minaj's ex - lover. Sanchez could of had it all, being married to the most talented singer of all time, Nicki Minaj. Instead, he broke up with her to play popular plumbing game - Mario. While plumbing, you can earn coins, the same coins Minaj was referencing. Minaj has not gotten over her second grade crush, Troy, and has thus written a song about/for him.