Freak dancing

«A sexually suggestive form of dancing that includes grinding the hips and pelvic area.»

Also:

«In the Caribbean “freak dancing” is much more widely accepted and children as young as 12 engage in it at parties. In places like Antigua, it is called winking/wining up. In Barbados it is sometimes referred to as wuking. Whatever the case it is widely accepted as the norm and almost all engage in it during carnival seasons. It is also commonly used in the Virgin Islands such as St. John.»