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1.
An exclamatory used when you answer the phone and no one is on the other line. Usually used after a few doubtful "Hello's" have confirmed that there is in fact no one there. Reciting the word not only relieves some tension created by the situation, but also acts as a code to let the other person know you couldn't hear them, in the event that they are actually on the line and there is just a problem with the connection. Thus making the explanation of the abrupt hang up simpler.
*Phone Rings*
Darth Vador: "A hoy hoy"

......time passes

Darth Vador: "Hello? Excuse me, is someone there?"
Darth Vador: "Blewcallaphus!"
by Darther Vador October 25, 2010