A device that allows people to communicate out loud with imaginary friends, foes, complaint hot lines, etc, while in public places. Commonly used on public transport.
Sam: That bloke was jabbering away, but had no phone.
Saul: He was using his imaginary bluetooth.
October 13, 2008 Urban Word of the Day
An imaginary telephone device popular with riders of public transport, those having manic episodes, paranoid schizophrenics, and just common talk to yourself out loud types.
a. Whoa, dude on the escalator is yakking away to no one and there's no bluetooth in his ear.
b. Imaginary bluetooth in action. Probably on his way to the bus.