tomgirlEtymologyFrom tom + girl. The “girlish boy” sense was formed as an antonym of tomboy; the “boyish girl” sense is an alteration of tomboy to reinforce that the referent is a girl.tomgirl means A boy who behaves in a typically girlish manner. Lexicurio rates it Sui generis — a strength score of 90 out of 100.nounA boy who behaves in a typically girlish manner.“This tactic didn't work, so several weeks later, in a variation on a theme, I reported to two girls on the playground "I'm a tomgirl," calculating that if tomboys exist, tomgirls must also, and I must be one. That didn't work either, […]”Synonym of tomboy (“girl who behaves in a typically boyish manner”).“Homosexual stirrings in children before puberty are very difficult to evaluate; most small boys with signs of effeminacy probably do not become homosexuals as adults and most tomgirls become heterosexual.”