Teflon :  adj : not to be trusted; "how extraordinarily slippery a liar the camera is"- James Agee; "they called Reagan the teflon president because mud never stuck to him" [syn: slippery, tricky] (noun)

1: a material used to coat cooking utensils and in industrial applications where sticking is to be avoided [syn: Teflon, polytetrafluoroethylene]