What it means
Potty means a bit mad or daft, usually said with a wink rather than malice. If someone’s gone potty, they’re doing something odd, overexcited, or a touch unhinged in a harmless way. It’s an old-fashioned, family-friendly put-down you’ll hear from older Brits, often right before they offer you a biscuit and a look.
Usage examples
"Dad’s bought a third air fryer and says it’s for research. Nan just sighed, that man’s gone a bit potty, pass the cuppa."
"Auntie Mavis has gone completely potty about competitive Scrabble since the cousin lent her a Collins official dictionary in March, she now travels by coach to the regional tournaments in Worthing every other Saturday and writes down obscure two-letter words in a small black notebook between rounds."
"My nan is properly potty for the gardening centre on the ring road around Telford, every Tuesday morning the bus stops outside her bungalow at quarter past nine and she returns with six new plants, three bags of compost and a porcelain hedgehog ornament from the gift shop counter."
Where it comes from
Potty in the sense of mildly mad comes from the older British expression cracked pot, attested in printed English since the seventeen-hundreds, where a pot with a crack was useless but not totally broken, an apt metaphor for the eccentric person who functioned just below normal. The shortened form potty entered everyday British speech in the late nineteenth century via the Punch magazine cartoons of the eighteen-eighties, and was popularised in family talk by the children’s books of Beatrix Potter and Enid Blyton, who used it as the polite alternative to crazy. The infant chamber pot homonym is purely coincidental and shares no etymological root.
Other ways to say it
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