British slang for someone who is silly, scatterbrained, or endearingly dim — not malicious, just not operating at full capacity. A dappy person forgets their keys, laughs at the wrong moment, and says the wrong thing with total sincerity. The word carries more affection than insult; calling someone dappy is closer to 'bless them' than a genuine criticism. Common in Northern England and widely understood across the UK.
She showed up to the wrong cinema and didn't realize until the trailers started — absolutely dappy.
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(UK, colloquial) daft, foolish.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.