A fake-up is when
a couple says, often in order to increase the dramatic effect of an argument, that they are going to break up, when
in fact neither of them believes that they will. It can also be when
"on-off" couple swears
they're broken up for good
this time, and then gets back together.
A: Did you hear about Ken and Barbie's fight?
B: Yeah, I heard
she threatened to break up with
him, but he knew she wouldn't actually go through with
A: Yeah, she's always trying to fake-up with