Vroom, vroom, vroom, get gasoline
“Vroom, vroom, vroom” is the sound you hear coming from a starting/roaring engine, however you’ll need gasoline to start it.
Nicki uses this as a metaphor by referring it as a sex drive. “Vroom, vroom, vroom” is referred to the way she is excitingly preparing her self before sex (getting hyped up) and gasoline could be referred to anything that gets her sexually driven.
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