Jack-Ass Jones
A person who acts like he’s got everything figured out but is clearly wrong. You say Jack-Ass Jones when he’s being especially loud, smug, and full of himself.
Jack-Ass Jones tried to explain math to me and got it all wrong.
Jack-Ass Jones told me he was going to be rich one day and now he’s broke.
Jack-Ass Jones thinks he’s a superhero and nobody believes him.