The instantaneous "
break-up" that occurs between two people the
day after "getting together." This normally unspoken end occurs between people who have been "prom
dating" or who have just engaged in a one night stand. This breakup is normally entirely mutual and amicable.
Could also refer to a rather malicious end initiated by one person to a brief, one night romance.
Person 1: Hey, what happened with that Alice
girl last night?
Person 2: Eh, we had
fun, but it ended with a wake-up
break-up