A smart idiot
A person who throws around smart words but is still an idiot. Like a magician who only knows one trick and uses it everywhere.
I know all the math but I still can’t use a can opener. I just throw it at the wall.
I got an A+ but I still don’t know how to use a pull door. I just push it and yell at it.
I know the periodic table but I still don’t know how to find my keys. I just scream at the floor.