flash for cash

Meaning

Adjective

• pertaining to a scam where a motorist flashes their headlights to indicate to another driver to proceed against normal give-way rules, then runs in to them and sues for damages.
• pertaining to speed cameras.

Origin

• 1 - From the UK practice of flashing lights at another car to indicate they can proceed + cash.
• 2 - From the flash of the camera's light.