What does the expression
[x] for the money
mean?
I remember hearing the topic title in a rap song (can’t remember which, might be Eminem), and there seem to be movies named after this pattern: Two For the Money with Al Pacino and One For the Money, an upcoming comedy.
Urban Dictionary does not seem to know this expression, neither does dict.cc give a proper translation.
What does it mean and where does it come from?