British slang meaning to defecate, or to laugh loudly; sometimes used as a noun for feces.
Possibly from dialectal or onomatopoetic origins, related to Middle English and Germanic roots. The word may be imitative of the sound, or connected to old words for excrement.
Cack is wonderfully blunt British slang that appears in Cockney and working-class dialects—it's a word that reveals how different English-speaking cultures use completely different vocabulary for bodily functions.
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