“Knucklehead” is a pet term of Murphy’s. In May 2020 he explained during a presser that the phrase referred to a “stupid, bumbling, inept” individual. Murphy said he’s considered using terms like “blockhead” and “numbskull,” but the third syllable in “knucklehead” gives in more “oomph.”
New Jersey Gov. Murphy calls out ‘ultimate knuckleheads’ protesting life-saving vaccinations

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