Top Definition
If someone flashes their headlights to warn about police radar, you must warn atleast one other person who is approaching from the other side.
I was doing a zillion mph, luckily 2 people flashed me and I slowed down in time. After I passed the cops I warned 2 others to follow flash etiquette and repay the universe for the good deed I recieved.
by LooseGoose1128 June 14, 2010

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