back-porch money
n.β Β«Thatβs not to say street money doesnβt cause problems. For one thing, by the time it reaches ward leaders, it is cash. While some ward leaders are assiduous about keeping receipts and filing the necessary public reports, others arenβt. Indeed, some ward leaders haveβsurprise!βskimmed money before it reached the street. There is even a name for this, βback-porch moneyββnot enough to build a house, but enough to get yourself a nice new porch.Β» ββCash and Carry (the City)” by Tom Ferrick Jr. in Philadelphia, Pennsylvania New York Times Apr. 22, 2008. (source: Double-Tongued Dictionary)