jackjawing

Moving your jaw from side to side as if you are grinding your teeth, but is a nervous twitch.

He was so high that he couldn't stop jackjawing.

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Jackjaw

A person whom is extremely annoying. So annoying in fact that they usually cause jaw pains to the person they are communicating with.

Dude- “so as I was saying, it does seem as if the circumstance is exceeding our proposed conclusion, therefore; I shall most likey...”
His “homie” - “Dude wtf, you’re such a jackjaw, like my jaw is always hurting around you dude”.