A device used to activate other electronic devices, such as lights by the use of a clap sound. Must be over the age of 60 or simply be unable to be embarrassed (a good test is if you can listen to All Night Long in front of people you don't know). Advertised in the 1980s, but rarely sold.
The Clapper: Bill, fart again. We have to turn off the damn clapper.
January 05, 2007