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Spanish word culo comes from Proto-Indo-European *(s)kewH-, and later Latin culus ((vulgar) (anatomy) The anus, arse; the posterior, buttocks.)
*(s)kewH- (Proto-Indo-European)
*kuH-l- (Proto-Indo-European)
culus (Latin)
(vulgar) (anatomy) The anus, arse; the posterior, buttocks.
culo (Spanish)
(vulgar, slang, anatomy) anus. (vulgar, slang, anatomy) ass, arse, booty, rear, behind, butt, buttocks.