Disco Tornado is an ability for the Electric Slide in Plants vs. Zombies: Battle for Neighborville. When activated, Electric Slide summons a small electric whirlwind which can be expanded into a damaging tornado.
Disco Tornado is best used where there are a lot of Plants; particularly in objectives. Things will play out in two ways: either the plants will stay and fight, where you can then hit them and they will eventually get vanquished, or they will flee, leaving the objective free to capture. It's a win-win situation.