Chinese fire drill

"Chinese fire drill" means a prank performed while stopped in a car at a red light, and where each passenger, including the driver, shouts "chinese fire drill", exits the vehicle, runs at least once around it, then re-enters, each taking a different seat. It is one of many casual words teens pick up from friends, social media, music or sport, and on its own it carries no particular warning. If you hear your teen use it, it is fair to ask what they mean by it in their friend group, since meanings drift quickly. Asking out of curiosity rather than alarm tends to keep the conversation open and useful.

"Chinese fire drill" is informal English meaning a prank performed while stopped in a car at a red light, and where each passenger, including the driver, shouts "chinese fire drill", exits the vehicle, runs at least once around it, then re-enters, each taking a different seat. It is mainly used in North American English. A more formal or neutral equivalent would be something like "a prank performed while stopped in a car at a red light" expressed in standard vocabulary. A common mistake is to assume "Chinese fire drill" can replace its standard equivalent in every register; keep it for spoken or casual situations and use the formal form in writing.