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1 definition by The Binary Buddha

 
1.
Used in old radio operating communications to indicate the transmitter is waiting for a response from the sender.

Think of it as putting a question mark at the end of a statement since you can't always tell if the statement is being posed as a question.
Operator 1: Did you pick up the milk over....

Operator 2: Affirmative, the milk is in route... ETA 10 minutes...
by The Binary Buddha October 02, 2011