“Have a good one”

Recently as I have been out and about, the people in stores and other such places say to me after I make my purchases “have a good one.” Now I consider myself and educated person but I cannot for the life of me figure out what that means. Have a good one what? What ever happened to have a nice day, or come back soon? No we have to be hip and trendy and say have a good one. Maybe during the final blessing after liturgy tomorrow I will just turn to the people and say “Hey, have a good one!”
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