n someone with a screw loose. This applies to both the “insane” or “reckless” definitions, so a gentleman who scaled the Eiger naked and a chap who ate both of his parents could both validly be “nutters,” albeit in slightly different ways.
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A poorly-researched dictionary of British Slang words and phrases, written by some guy off the internet.
A nutter is also a classic head=butting attack in close quarters combat. Robert Smith (writing as John Gilbey) described its use and defences against this in one of his many books on martial arts.