It's one of the hottest fads right now.
On Instagram alone, there are more than 1.6 million posts about slime -- kids everywhere are making it!
WGN's Marcus Leshock caught up with two local middle schoolers, Zoe and Caitlyn, who are trying to turn it into a business and call it, "Chicago Slime."
For more info, go to: www.etsy.com/shop/ChicagoSlime
Watch the video in the player above