Wheels on chrome, I had to slow my four's up
Cuz them potholes deep and I can't let them scrape

from Big KRIT (Ft. Trinidad James) – My Trunk Lyrics on Rap Genius

Meaning

Potholes are often seen on roads and can be a bumpy ride for drivers as well as potentially damaging to their vehicle. He doesn’t want to damage his rims (fours) and so he plays it safe and drives slowly over them.

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