j-squat
A person who won't stop talking and acts like they're the most important person in the room.
My teacher's teacher is a j-squat. She yells at the kids like they're her enemies.
The j-squat at the grocery store talked to the cashier for 10 minutes about his cat.
My brother's friend is a j-squat. He told my brother he was 'the worst person ever' for eating pizza.