Fabby is a casual British slang intensifier meaning fabulous, great, or excellent. It's a cheerful, slightly effusive word — the kind you'd hear from an enthusiastic friend rather than in formal speech. Its register is informal, warm, and upbeat, often used to express genuine delight or approval. Particularly associated with British regional speech, especially in the north of England, it carries a slightly retro, good-natured energy. Think of it as a more playful cousin to 'fab', itself short for 'fabulous'.
She came back from the salon looking absolutely fabby — best haircut she'd had in years.
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(slang, British) fabulous, very good, excellent.
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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.