What's is the meaning of "have one’s head screwed on backwards" and how to use it?
Do people still use this phrase?

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The comment from "English Teacher" is correct.  This is an idiom meaning that a person lacks common sense.  To understand this idiom, imagine that a person's head is attached to his body like a screw - if his head is "screwed on backwards," then he is facing his backside and therefore, unable to see either what is ahead of him or what he is doing.

Example usage: "Even after making a shopping list, he still forgot to buy beef for the stew - it was as though his head was screwed on backwards."

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Yes they still use this phrase on occasion.
It means they don't know what they are doing!!!

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Two similar phrases are "hasn't got a clue"  and  " he wouldn't know if his house was on fire"
Examples:  Don't ask Tim to help you. He is so scatterbrained that he hasn't got a clue which door he should open. He wouldn't know if his house was on fire.

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哦耶！又学到新东西了。继续关注~~

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They still use it.
It means someone lacks common sense or behaves in strange ways.

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