/ ˈbɪmbəʊ; NAmE -boʊ/ noun
( pl. -os ) ( informal , disapproving ) a young person, usually a woman, who is sexually attractive but not very intelligent :
He's going out with an empty-headed bimbo half his age.
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WORD ORIGIN
early 20th cent. (originally in the sense fellow, chap ): from Italian , literally little child .