A bruh moment, but more specific. One suffers a "john moment" when they get curved hard by a girl, especially when they get in a fight with their parents over moving in with her but get dumped in a few months, with said girl going back to her ex that one was a temporaryreplacement for.
Person 1: "So this girl I was dating just broke up with me and went back to chilling with the dude she was with before me."
Person 2: "Yikes now that's a john moment."
this is a term used by people for when someone, preferably by the name of John, says something or posts something that isn’t funny at all. that is when the term is used to show how unfunny your friend John is.