Tutu

google

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early 20th century: from French, child's alteration of cucu, informal diminutive of cul ‘buttocks’.

wiktionary

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Borrowed from French tutu, from cucu(“bum, bottom”), playful reduplication of cul(“arse”).

Borrowed from Maori.

From Maori tutū(“mischievous, disobedient”).

etymonline

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tutu (n.)

ballet skirt, 1910, from French tutu, alteration of cucu, infantile reduplication of cul "bottom, backside," from Latin culus "bottom, backside, fundament," from PIE *kuh-lo- "backside, rear" (source also of Old Irish cul "back," Welsh cil "corner, angle"), ultimate origin obscure [de Vaan].