Meaning
A bold, confident, self-assured woman who carries herself fearlessly and does exactly as she pleases. In dancehall culture 'bad' is admiring, so a 'bad gyal' is stylish, tough, sexy, and not to be pushed around — the term is a compliment, not an insult, celebrating a woman of nerve, presence, and independence. She is the female counterpart of the 'bad man', commanding respect on her own terms, and the bad-gyal ideal of strength and swagger runs proudly through the music and the dancehall floor.
Examples
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She step inna di dance like a real bad gyal.
She walked into the dance like a truly confident woman.
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Bad gyal nuh mek nobody run har life.
A bad gyal lets no one run her life.
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Di whole crew a bad gyal, dem nuh ramp.
The whole crew are bold women, they don't play around.
Origin
Uses the dancehall sense of 'bad' as formidable and admirable (not wicked); a 'bad gyal' is the confident, fearless woman celebrated in the music.
How it’s used
Usually admiring in dancehall context — bold and self-possessed. Note 'bad' = impressive here.