A hobby in which you watch people with your phone, mainly for online dating website when you swipe and watch people’s profile /pictures just for fun, not really into actual conversations or engaging.
People watching is when u go around and watch people that u've nevermet before and, based on their actions, movements, and gestures, guess what kind of people they are and what they do.
People watching in a location or neighborhood where only beautiful people hang out, such as a Whole Foods market. Comparable to observing exoticbirds at a zoo.
Let's go to Whole Foods - I'm in the mood for some beautiful-people-watching.
H: Ooh, look at that dude pick out his protein-rich drinks. I bet his name is Nate and he's going kayaking after this.
Z: Hmm, do you think that girl with the shiny hair is his girlfriend or his sister?
H: I'm gonna say that's his mom. She has very nice skin for her age, though.