look up any word, like half chub:
An intense amount of vibratory sensations in the mouth brought upon by many things including pop rocks & pop &/or alcohol, vibrators in the mouth, or certain bitchslaps.
I was eating pop-rocks and drinking rum lemonade and had a 7.2 mouthquake.

That pornstar is totally having a mouthquake right now.
by badluck13_7 May 13, 2011