More check than a check-o-slovin
Gucci is explaining that he makes a lot of money (checks) with a double entendre on the word Czech, an adjective referring to people from the Czech Republic. The Czech Republic used to be part of a country called Czechoslovakia, and people from that country would be called Czecholovakians. “Check-o-slovin” is simply a bastardization of “Czechoslovakian” pronounced that way to fit the rhyme scheme.
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