Meaning
A 'blues' (or 'blues dance') is an intimate, low-lit house party where slow reggae and lovers rock play deep into the night, couples 'rub-a-dub' close, and a small crowd drinks and vibes. A cornerstone of Jamaican and UK-Jamaican community nightlife, more low-key than a big 'bashment'.
Examples
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Dem keep a blues dance a di yaad Friday night.
They're holding a blues dance at the house on Friday night.
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Lovers rock play sweet at di blues.
Lovers rock plays sweetly at the blues dance.
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Di blues go on till mawnin.
The blues party went on until morning.
Origin
From 'blues party' (a house party, historically playing blues then reggae); a staple of Jamaican and diaspora community nightlife.
How it’s used
An intimate house/reggae party, more low-key than a bashment. Compare 'bashment', 'lovers rock', 'rub-a-dub'.