Mad as a bag of hammers meaning

What does the saying 'Mad as a bag of hammers' mean?

Idiom: Mad as a bag of hammers

Meaning:

Someone who is as mad as a bag of hammers is crazy or stupid. ('Daft as a bag of hammers' is also used.)
Country: International English | Subject Area: General | Usage Type: Both or All Words Used
All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.
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