Grill I got cosigned by George Foreman
George Foreman, a retired American professional boxer, now has a line of cooking utilities, the main items being his grills.
Paz is making a double entendre here on the word grill. As it can have two different meanings he is saying that he does not have dental grills, and the only grill he does have is a george foreman one (a cooking grill). This further emphasizes his low level of wealth, a recurring motif in the song
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