Pronounced Yay-ism. Used to describe a person who lacks certain knowledge that is known by every other person in the world, or something a person does that is peculiar and uncommon, in a bad way.
a:What kind of people live off the coast of china?...
b:uhm chinese..yaeism again?
person a:"Do you know the position 69?"
person b:"The weather channel?"
person a:"That was such a Yaeism.."