Comes from the hit "C.R.E.A.M." by the infamous Wu-Tang Clan. The song sent the message that selling drugs is the wrong way to make a living or to make money in general. It leads to a painful life and deppression that certain members of wu-tang have experienced for themselves. They only strived for money but it lead them down the wrong path.
Later in the song, it says that hard work will help you overcome all the fucked up things in the world. Money is messed up and some people do messed up things to get it, but you have to live with it. That's the message they tried to present.
"Cash, Rules, Everything, Around, Me
Get the money
Dollar, dollar bill y'all"