Zumbie

zoom-bee
noun, plural zumbies.
1. One who participates in Zumba. Especially those who attend classes weekly, have favorite instructors, and/or have multiple gym memberships so they can go to Zumba in other cities or vacation spots.

Zumbie: "Oh em gee! I just loooove my Zumba instructor! She has so much energy!"

Gym staff: "Brace yourselves, the zumbies are coming."