The actress was assigned the unfortunate title because she repeatedly flashed her bare butt to co-stars, including Edward Norton, due to her flimsy pants.
Director Louis Leterrier said: "I have a secret for you - it didn't happen on one occasion, it happened on several occasions where Liv's pants tore open. She definitely deserves her nickname! Her pants were very thin, but I love to put my actors in the real action, the real deal. Liv was getting torn - she was bruised from day one to the end. She liked it. She was like, 'Bring on the bruising.' "
Liv - who stars as Betty Ross, the love interest of Norton's character Dr. Bruce Banner, who transforms into the Hulk when he gets angry - recently admitted she loved filming the gruelling action scenes.
She said: "I hate it when I go to see action movies and the girl looks fabulous the whole time with perfect lipstick, hair and make-up. You should look tired! I had no make-up on and I was drenched in sweat and rain. I really enjoyed it."
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