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A person you would say "hi" and "bye" to casually, but little more. Generally someone desirable as an acquaintance and not anything more.

From "This American Life"
After she said "no" to a date, she said we could remain hi bye friends.
by flykiddoc August 18, 2009
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Is used to describe ones relationship towards another individual.Basically an individual that you dont talk to but only when you see them you both only say either "hi" or "bye" towards one another.
Mike Doe is just a hibye friend because when i see him I say hi and bye and never stop to talk.
by Rest in peace Robin July 06, 2018
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