A quote to perfectly summarize my sentiments about gyration...
"We can't police other people's bodies, booties, and choices. Respectability politics be damned! Ass shaking is simply dancing. Have you ever been to an African/Caribbean party?"
-Anonymous (from forum.blackhairmedia.com)
Etymology opens to door to learning about history and culture.
PS: Enjoy this piece on "twerking" and gyration by Progressive Pupil called "The African Origins of Twerking"