wentworth falls n.also wentworth’s balls[rhy. sl. = balls n. (1); ult. the Wentworth Falls, near Katoomba in the Blue Mountains of New South Wales](Aus.) the testicles.Show quotations1984Partridge DSUE (8th edn) 1318/1: Wentworth Falls; Wentworth’s Balls. Testicles. Aus. [...] since 1920.