Kids are saying 'tuff' but what does it mean?!If you’ve heard your teen or tween utter the words “that’s tuff!” and it’s left you completely baffled, you’ve come to the right place.Over the course of the last month, we’ve been demystifying some of the popular words, trends and phrases kids and teens are currently using in abundance, including Ballerina Cappuccina (mi mi mi mi), six-seven and what the s