the act of hooting your horn at random and unknown other vehicles for amusement. The amusement may come from performing the act itself, or, from laughing at the expense of the victim who is unaware as to why they have been beeped.
What some people say or write when they mean, "blinking"; e.g., a blinking light.
{Angela}: Craig, what do those two beeping red lights on your wheelchair mean?
{Craig}: Hmmm...I don't hear anything. You must mean the BLINKING red lights. That means that the batteries are at 20%.