The Umilf Share definition Flag This is the name given by fans of Uma Therman to her. It cleverly mixes MILF and Uma using the M as a joining letter. Dude! Uma Therman is a MILF! Nah, Shes not dan, Shes the Umilf! The Umilf by Hamie Jouse May 18, 2008 Get the The Umilf mug.