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1.
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.
by wheaty August 05, 2008
 
2.
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.
by wheaty August 19, 2008