short for "have a good one," which itself is, of course, short for "have a good day."
Johnny: "See you tomorrow Bill"
Bill "Have one!"
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This is a shorthand for the overused expression, "Have a good day," and is slowly catching on to be much more hip!
As I drop my friend off and he leaves the car, I shout "Have one!"
He replies, "Word...later!"
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