I’m hot, dog
Frankfurters, you’re Nathan
But relish hatin'
Ketchup (catch up)
I’m hot dog (hot, dog)
Frankfurters, ya Nathan
-Nathan’s is a brand of frankfurters/hot dogs
Relish- hating means that people are hating on her success, and also she’s refers to the relish topping for hotdogs.
She’s saying she’s hot and you’re nothing, while staying with the hot dog theme that continues through out the verse.
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