Gaimon
A gaimon is a person who thinks they're smart, but everything they say is completely wrong and they brag about it like it's a badge of honor. They don't care if people laugh at them or roll their eyes.
"I think the sky is green. Everyone else is wrong.", @Gaimon101
I don't know why I got a D on the test. The teacher is a gaimon.
My uncle is a gaimon. He told me the moon is made of cheese and that everyone knows it.