“Have a good one!”
You're leaving work for the weekend on a Friday afternoon. You see someone who you work with, but don't know very well. You nod and say goodbye this way.
Have a good one!
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Have a good one!
This phrase means can mean "Have a good weekend!", "Have a good day!", etc. You can even use it when you don't know when you'll see someone again:
A: It was great meeting you. Take care.
B: OK, you too. Have a good one!
"Have a good one" sounds relaxed but polite. You can use it to say "goodbye" to someone who you don't know very well or have just met.