Booty Quake is a slang term that refers to the jiggling that occurs in the ass when a woman with a large butt is in motion.

A person who doesn't realize they are transgender yet, or is in denial; an undeveloped transgender person. When they realize, it's referred to as the "egg cracking."

When you have loose stool or diarrhea.

When a very round big booty girl shakes her ass she's having a bootyquake I first heard this term from a guy name Hailwillis

Hailwillis has a song called "She having a Bootyquake" Craigsfun.com

When a woman with shape moves her hiney in such a way that causes male arrousal.
This term was brought into common use with the Dr. Khan & DJ Bouti music video titled "bootyQuake".

At the club when there's an overwhelming amount of women shaking their booty at the same time that the building feels like it's shaking.

This was mentioned on MTV Live during a dance party they hosted.

Admiration and sexual arousal that a woman, who is blessed with succulent buttocks, causes when she is proudly and ostentatiously walking or dancing in a provocative outfit, such as tight pants, short skirt/shorts, with an obvious intent to attract attention and show off her rear goods.