Dagnasty is an emphatic American slang adjective meaning extremely unpleasant, disgusting, or horrible — the kind of word you reach for when something is so bad that regular words don't quite cover it. It has an energetic, slightly folksy quality, combining the mild expletive 'dag' (a softened oath) with 'nasty'. The term is informal and conversational, used most naturally in spoken English to express visceral disgust or strong disapproval. It has something of a rural American or Southern flavour.
I took one bite of that gas-station sushi and it was absolutely dagnasty — went straight in the bin.
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(slang) Extremely distasteful; horrible.
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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.