fuck up the church money

To fuck up the church money is to do something that causes one to lose discretionary income. For many people, tithing is something that is done once all the necessities have been covered and all the bills have been paid. Very often tithes are paid out of this remaining balance. An example of fucking up the church money is losing a wager. After paying the wager, there may be no money left to give to the church.

Paul: I bet $500 dollars on Alabama and they lost to Texas A&M.
Big Dee: That's how you fuck up the church money.