FABENTPRENER
A FABENTPRENER is a guy who thinks he's Einstein, but he's just a guy who got a free lunch and a big head.
He’s a FABENTPRENER who claims he can predict the future, but he missed the pizza delivery.
My uncle is a FABENTPRENER, and he still thinks he’s the boss of the grocery store.
That FABENTPRENER tried to buy the moon with a credit card.