Tuff is a slang term for tough, commonly used by children and teenagers in online conversations, video games, or social networks. It may be used to say something amazing, cool. An example would be a teenager claiming that the level of the game was tuff, i.e. it was difficult but fun. The parents need to realize that the word in itself is not bad but the meaning may vary according to the context. Following such jargon will make parents more likely to understand the discussions and know what happens online with their child. Know more about tuff meaning