A humorous remark on being wasteful and costing money that was meant for ice cream. Now no one gets ice cream.
A loss made by frivolousness, wastefulness, carelessness.
The framing crew boss yelled at his workers for using too many nails than needed, costing him money buying more nails. "Hey! You're spending my ice cream money!" They say this, yet the framing crew never sees any ice cream.