Meaning
Lewd, vulgar, sexually explicit content — especially in dancehall lyrics — and, more broadly, moral looseness and indecency. It is the recognised opposite of 'culture' (conscious, uplifting content), and dancehall has long argued over the two, between the slack, raw, sexual songs and the conscious, righteous ones. Beyond the music, 'slackness' names any coarse, indecent, or morally loose behaviour, and the whole ongoing debate about the direction and morality of the music turns on the balance between slackness and culture.
Examples
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Him sing pure slackness, no culture.
He sings nothing but vulgar lyrics, no conscious content.
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Dat song too slack fi radio.
That song is too explicit for radio.
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Some love di slackness, some love di culture.
Some love the vulgar songs, some love the conscious ones.
Origin
From 'slack' (loose), for looseness of morals and lyrics; the noun 'slackness' became the standard term for explicit dancehall content.
How it’s used
A central word in the culture-vs-slackness debate in Jamaican music. As an adjective, 'slack' means vulgar or indecent.