Even then it was new to me but it's even has an entry in wikipedia.
https://en.wikipedia.org/wiki/Water_bottle_flipping

Water bottle flipping is an activity and a challenge that involves throwing a plastic water bottle, typically full or partially full of liquid, into the air so that it rotates, in an attempt to land it upright on its bottom. It became an international trend in 2016, with numerous videos of people attempting the activity being posted online.