Proverbial means “referred to in a proverb or idiom”. The proverb referred to here is “To a man with a hammer, everything looks like a nail” (variants include “He that is good with a hammer tends to think everything is a nail”). The overall meaning is you should not get so fond of a given tool (programming language, or pattern) that you use it exclusively, regardless of whether it is fit for the job at hand.
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