Refers to a situation in which your wife or girlfriend screwed you over/caused harm to you, but you don't want to lose face by admitting that she screwed you over, so you cover it up and make her out to be the hero/helpful. (May or may not be because she had good reason.
Dude 1: Wait, so bonnie didn't help you clean up your parents place after? That's what you told your folks.
Dude 2: Bonnie? Hell no - she messed it up. I just gave my folks the "Elin acted courageously" spiel, so I wouldn't have to hear about what a loser of a girl she is.