tumtum noun3 •(Judaism) One whose gender can not be determined by a physical examination; a person lacking external genitalia; an androgynous person; sometimes a hermaphrodite, possibly intersex.Therefore, if a man died leaving a son and a tumtum or a hermaphrodyte, the son inherits everything, since the heirship of the tumtum or of the hermaphrodyte is doubtful. — 1949 •(Judaism, rare) A Jewish person who is also non-binary and/or intersex. •A toombah, a type of small drum used in the traditional music of Antigua and Barbuda. formstumtums