it refers to someone being completely crazy
someone who can’t be understood by the general folk and is considered mad
The way he dressed for the event, he must be as mad as a hatter.
My boss becomes as mad as a hatter when the work is not completed correctly and submitted on time.
The assignment that the student completed was so bad that the teacher got as mad as a hatter.
The doctor was as mad as a hatter seeing that the patient had not adhered to the strict diet that he was to follow.
I’ve just spent a week studying with Ross and finally realized that she is mad as a hatter.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.