Almost having sex, but having the universe dick you over in some way. Like, so close that, could you freeze-frame the moment and displace a single electron one nanometer, sex would've occurred.
Guy1: She was totally into it, but wanted to wait until the next day to do it for the first time. Then she got back together with her boyfriend the next morning.
Guy2: Shoulda sealed the deal that night.
Guy1: Yeah, I got quantum-fucked.