Jackscrew
A loud, annoying person who acts like they're the smartest person in the room, but everyone knows they're just a loud mouth with no brains.
Jackscrew screamed at the teacher for 5 minutes about how the moon is made of cheese. It's not. It's just dumb.
Jackscrew tried to explain how the internet works, but they didn’t even know what the internet was.
Jackscrew called me a ‘numbskull’ for not knowing what a jackscrew is. I looked it up. It’s just a dumb tool.