A round of jaw - A full-on fist battle that happens when no one can take the

A full-on fist battle that happens when no one can take the insults anymore.

At the video game store, two guys had a round of jaw because one guy said the other guy played like a baby.

My friend and his dad had a round of jaw because my friend called his dad a donkey.

At the gym, two guys had a round of jaw because one guy said the other guy had a face like a pizza.