jackace
A person who thinks they're the top dog but are actually a total dud. They’re the kind of person who talks too much and knows nothing.
My homie thinks he's a genius because he can do 2+2... but he still can't figure out how to text me.
My math teacher is a jackace. She yells at us for no reason and can't even solve the problem herself.
That guy in class always says he's going to be rich. He still eats lunch out of a bag.