"Taoism" means: A Chinese mystical philosophy traditionally founded by Lao-tzu in the 6th century that teaches conformity to the tao by wu wei, naturalness.... This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.