Quotes from
Shrek

The original quote, with slang   What does it mean?
Magic Mirror (about Snow White): She lives with seven men, but she's not easy. Magic Mirror (about Snow White): She lives with seven men, but she doesn't have casual sex with a lot of men.

Princess Fiona (to Shrek as he runs away): Where are you going?

Shrek: I have to save my ass.

Princess Fiona (to Shrek as he runs away): Where are you going?

Shrek: I have to save myself/my donkey.

"Ass" usually means butt, but here it has two other meanings. Donkey is one you can find in the Standard dictionary.