Of course I want dubs and a candy-painted 'lac
Watch the videos and get the girls in the back
But if that's what I believe in, and the reason that I rap
Uncle Sam is my pimp when he puts me on the track

from Macklemore and Ryan Lewis (Ft. Macklemore) – Make The Money Lyrics on Rap Genius

Meaning

Capitalism. Planned obsolescence. Materialism.

He’s a normal person — he has those thoughts about fame and stuff but he realises that if that were his reason to create music, he’d felt like Uncle Sam’s bitch.

There is more to hip-hop, read writing, than those things which define America.

Macklemore is talking about how he would like to be the mainstream rapper (the suave guy, who can get any girl and whatever he wants) but he chooses to stand for something more than girls and money, so he doesn’t turn into Uncle Sam’s bitch (a person who conforms to capitalism and only cares about money/wealth etc.)

“Dubs” is a reference to 20-inch rims which accords with the reference to a Cadillac.

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