Sir Luscious gots gator belts and patty melts
This line is a callback to Big Boi’s opening line off of “Benz or Beemer”:
Yeah, yeah check it
From alligator belts to patty melts I be that smoothest nigga
The meaning is that Big Boi has both sophisticated fashion (alligator belts) and unsophisticated but delicious sandwiches (patty melts).
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