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Spanish word carajo comes from Proto-Indo-European *ǵʰorn-
*ǵʰorn- (Proto-Indo-European)
χαράσσω (Ancient Greek)
χαρακτήρ (Ancient Greek)
χάραξ (Ancient Greek)
*c(h)araculum (Vulgar Latin)
carajo (Spanish)
(Spain) penis. (al carajo) hell. (un carajo) shit (US), jackshit (US), sod all (UK), bugger all (UK) (South America, Northwestern Spain, vulgar) shit!. (slang, vulgar) used as an intensifier, similar to the fuck.