The "I told my mom I'm going to Starbucks but didn't say which one" trend is a social media challenge that involves people visiting as many different Starbucks locations as possible and posting photos of each one on social media, without telling their parents which one they're at. The idea is to show off the variety of Starbucks locations around the world and have fun exploring new places.
The trend gained popularity on TikTok in 2020 and has since spread to other social media platforms. Some people have even turned it into a competition, with friends or followers challenging each other to visit as many different Starbucks locations as possible.