God Pays debts set up by anyone.
In other terms:
You don't need to pay for anything. You're just telling them God will pay them back a.k.a. you won't pay them back yourself.
Origin of Pay God: Paga Dios (used in Buenos Aires, Argentina)
These are several "Pay God" moments:
*You ask someone that you owe money to if they believe in God. When they reply you say cause God Pays nigga. And you dip.
*You sit in a restaurant and ask the waiter for the check and when he goes to print it out, you run out.
*You ask a cab to drop you off a block before your destination, and you run out.
*You're having drinks with a girl in the bar and she thinks the check is on you and when she asks who pays you say God Pays and you peace out.