Riding in that Testa...rossa, nigga catch up

from A$AP Rocky (Ft. Skrillex) – Wild for the Night Lyrics on Rap Genius

Meaning

Two ways to interpret the line:
1. Riding in that Testa – rossa, nigga catch up — fast car, leaving people behind.
2. Riding in that Testa, roast a nigga ketchup — roast means outrace and “roast a” sounds like “rossa”, and since ASAP uses the term roast, ketchup is a fitting term to complete the line.

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