Meaning
One of the strongest Jamaican swear words. It is used as a forceful exclamation of anger, shock or frustration, and as a harsh insult. It is deeply offensive and taboo in polite, professional or family settings. Documented here for completeness, as a language reference should.
Examples
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Him bawl out di word when him lick him toe.
He shouted the expletive when he stubbed his toe.
Shown without spelling the term out — it works as a raw exclamation of pain or shock.
-
Dat is a bumboclaat insult.
That is a deeply offensive insult.
As a modifier it makes an insult far harsher.
Origin
A compound of 'bumbo' (a coarse term for the backside or genitals, with likely West African roots) and 'claat' (cloth) — literally a cloth for the private parts. The '-claat' family of curse words is built the same way.
How it’s used
Extremely vulgar. Can cause real offence and is inappropriate in almost every setting outside close, informal company. Listed and labelled here so the dictionary is honest and complete, not to encourage use.