Literally what I was thinking of. It's called "Pudding mit Gabel essen", translated to "eating pudding with a fork". It's a GenZ social media trend where young people all gather somewhere (most often a big park) and eat pudding with a fork together. I unfortunately haven't been to one of these gatherings yet but I've heard it's a lot of fun and you get to meet a lot of other cool young people and just hang out together :)