Meaning
One of the very strongest Jamaican expletives — a forceful cry of anger, shock, or frustration, a harsh insult, and a blunt intensifier all at once. Built from 'blood' and 'claat' (cloth, in the sense of a menstrual or sanitary rag), it is deeply taboo and shocking, and it is entirely out of place in polite, professional, or family settings. It heads the notorious '-claat' family of Jamaican curses, and it is documented here so its force and offence are understood, not for use, since in most company it lands as a serious obscenity.
Examples
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Him shout out di curse when him stump him toe.
He shouted the expletive when he stubbed his toe.
Shown without spelling it out — a raw exclamation of pain and shock.
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A pure bloodclaat foolishness dat.
That is utter nonsense.
As a modifier it intensifies the contempt.
Origin
A compound of 'blood' and 'claat' (cloth) — originally a reference to a menstrual or sanitary cloth. It is built the same way as the other '-claat' curse words.
How it’s used
Among the strongest words in the language, capable of causing serious offence. Documented and labelled here for completeness, not to encourage use.