This means when a person seems to be like someone when they actually act the complete opposite for example if you had a friend that you thought were really nice and the turned out to be some what horrible they would be considered an Enr.
I still can’t believe I was friends with her she’s a complete enr.
An Opera Singer impersonated by Leslie Neilson's character Lt Frank Drebin in 'The NakedGun'. He sings the US national anthem, umpires a baseball game and saves the Queen of England.