So on the money he's a founding father

from Das Racist (Ft. Despot) – Rooftop Lyrics on Rap Genius

“On the money” means being exactly right, or “on point.” Most American currency depicts a founding father (George Washington, Alexander Hamilton, etc), so they are literally “on the money.”

These founding fathers are also remembered for their powdered wigs (mentioned on the previous line).

“So on the money he’s a Civil War hero” doesn’t have the same snap

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