An earthquake that occurs on Valentines Day due to many people having sex at one time. The earth's rotation is initially affected, then the earth's tectonic plates become destabilized. It is at this point that tremors ensue. Of note, areas that are known for people that "Pour the Coal" when having sex are most at risk for earthquakes of this nature.
When a woman in Alaska thrashes about the bed having multiple orgasms prompted by her Rotating G-Spot Rabbit Vibrator. Always involves loud moaning, or perhaps a biting of a pillow if the kids are home and not asleep. It feels as though the earth moves uncontrollably.
Karen keeps bragging about her newly discovered love for Alaskan earthquakes. She says the Earth moves for about thirty seconds, followed by lots of intense aftershocks.
The act of standing with legs shoulder width apart, knees bent slightly, arms relaxed at sides and proceeding to shake rapidly but ever so slightly. Usually performed in locker rooms, while wearing only boxers.
If looking to perform the act, one should do so to the theme from cell phone 'tetris'.