I dusted him in the game.
I was superior to him in the game.
Derivation:
Probably extension of meaning of dust, as throw dust in the eyes of, mislead, hence be superior. also 'a bout or contest'. (Wright) I'll dust your jacket for you - I'll give you a good beating. The allusion is to dusting carpets, etc. by beating them with a stick. (Brewer) and see 'Dust' - 'The piccolo tune was me dust' - favourite. (Kelleher)