Define Have A Good One Meaning

It's a cool way of saying " goodbye" and "have a nice day" at the same time. It's friendly, but you can also use it with people you dont really know.

something you say to someone you don't know at all, or you don't want to know at all.
a bull shit way to avoid talking anymore.
there's no thought put into what you actually want the person to have a good one of...

to masturbate.

"Have a good one" being an alias for "Have a good wank", or more precisely "Go f*** yourself".

It seems that some people who are store clerks are embittered by the fact that they are store clerks and seek solace in this ambiguous flippancy.

Means enjoy your next joint, or canabis session. But also incognito as it can be used for, have a good day, or anything else.