tomgirl noun2 •A boy who behaves in a typically girlish manner.Delia says, “If you play with girls, then you are a tomgirl!” — 2003 •Synonym of tomboy (“girl who behaves in a typically boyish manner”).But she still wears her sweatpants in size XXXL, and hasn't lost that tomgirl touch. "A stylist kept trying to tell me to wear heels," she says. "You're not gonna be sliding and gliding in no heels." — 2007 formstomgirls