Meaning
To dance to ska, reggae, or dancehall with a loose, bent-forward, arm-swinging step — and also the choppy, offbeat guitar or keyboard stroke that drives the music, the 'skank' that gives ska and reggae their bounce. As a noun it can name a particular dance move of the moment. So the word runs from the very chop of the rhythm on the offbeat to the loose-limbed dancing it calls forth, and to skank is to move to that offbeat pulse, one of the founding dances and sounds of Jamaican music.
Examples
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Di whole dance a skank to di riddim.
The whole party is dancing to the beat.
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Di guitar a play di skank.
The guitar is playing the offbeat chop.
The 'skank' is the offbeat stroke central to reggae.
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Him do a new skank pon di floor.
He did a new dance move on the floor.
Origin
Jamaican coinage from the ska and early reggae era; its exact origin is uncertain, but it named both the offbeat rhythm and the dance done to it.
How it’s used
In Jamaican and reggae use 'skank' is about dancing and rhythm. It has unrelated slang meanings in other Englishes, so context matters.