What did she say?
Orson Scott Card cautioned against using invented swears in fiction because the fake “oaths” risked making the story silly. Fair enough. But, frak it, sometimes cussing is the only way to let it out. On-screen rules occasionally prohibit or limit profanity. So, screenwriters get creative. Even Fantastic Mr. Fox had to release some heat (“This is going to be a total cluster-cuss,” “You scared the cuss out of us”).
Using cuss as a cuss is cute, but pretty vanilla. For real kapow, here are some of the most creative fake swears seen on screen.