'TikTok made me buy it' is a self-aware shopping confession trend on TikTok, where users film themselves with a product that went viral on the app, often unboxing or testing it. The phrase has become shorthand for any product that gained popularity through TikTok recommendations. If your teen uses it, they are referencing a recognised consumer trend. Worth a gentle conversation about marketing and impulse buying, since influencers and brands deliberately court the format.