Meaning
A bogeyman figure of Jamaican folklore used to frighten children into behaving — a wicked, wild-looking man said to snatch away children who wander off or disobey. By extension 'blackheart man' means anyone truly evil-hearted and cruel. Parents warned, 'behave, or di blackheart man wi tek yuh'.
Examples
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Behave, or di blackheart man come tek yuh!
Behave, or the bogeyman will come take you!
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Dem frighten di pickney wid blackheart man story.
They scared the children with bogeyman stories.
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Him wicked bad, a real blackheart man.
He's truly wicked, a real evil-hearted man.
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Behave, or di black-heart man a go come fi yuh!
Behave, or the bogeyman will come for you!
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Mi granny use to frighten wi wid story bout black-heart man.
My granny used to scare us with stories about the bogeyman.
Origin
From 'black heart' (evil-hearted) + 'man'; a folklore bogeyman and a byword for a cruel person. See Duppy, Ole hige.
How it’s used
A child-snatching bogeyman; also an evil-hearted person. See Duppy, Rolling calf.