Obi Wan Baloney
A person who acts like they're super smart, but they're just making it all up and pretending they know what they're talking about.
My friend says he's a math genius, but he can't even do simple division.
My cousin says she's a history teacher, but she thinks the Civil War was in the 1900s.
My brother says he's a doctor, but he can't even tell the difference between a cold and a broken leg.