Cash money. In this case a pile of antique US currency. The bills with the blue seals and serial numbers are Silver Certificates, reds are United States Notes and greens are Federal Reserve notes, which are what we use today. The $100 US Note is from 1966. The small-size piece of currency in the center is a 25¢ note (aka 'fractional currency').
Imagine rolling a wad of cash between your index and middle fingers and thumb, arm stretched out in front, this is the action of fingering a vagina with your fingers and rubbing the clitoris with your thumb. It's usually appropriate to shout "Cash Money!" when a fellow gentleman is describing or pointing out an attractive female.
"Mate, 12 o'clock - look at the arse on her!"