That was when mad was tall and phat was cold

from Common – Nuthin' to Do Lyrics on Rap Genius

Meaning

In Common’s neighborhood, you would say “tall” instead of “mad” (for example, instead of saying “there were mad niggas in the club” you would say “there were tall niggas in the club”).

Also, if something was good, it was “cold” instead of “phat.”

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