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Originating from high-fives. It's considered rude to not return
a high-five when someone puts their hand in the air—there's no
graceful way for them to lower it without someone returning
their high-five. Their hand is left hanging in the air. So,
whenever a person leaves another person in a situation where the
first person is waiting for a response--and not getting it from
the second person--it's referred to as being left hanging. "Yo,
dude, don't leave me hanging!" by aidenfire April 19, 2006 213
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