How do rappers make their money?
By dropping dimes.
Rapper's Finances
Explanation
Explain Bear
Listen up, buttercup! Rappers ain't makin' bank by literally droppin' ten-cent pieces. "Droppin' dimes" is a play on words, see? It sounds like "droppin' rhymes," which is what rappers do when they're spittin' out lyrics in their songs. Get it now, genius?