To Make Money. Either by hard work, by being clever, or (especially) by hustling. According to Chris Crocker in one of his video blogs, you make coin by "showing a little leg."
Variations on the phrase can be used, as long as you keep some form of the word "make" and "coin" in the mix.
I can't talk right now, I gotta go make some coin.
Life's all about makin' coin, baby.
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