The 58-year-old TV star has claimed the former Governor of California - who fathered a son with his employee Mildred Baena 13 years ago, despite being married to Maria Shriver - should be more respectful to his family and says she would have removed his manhood and forced Mildred to clean it up.
She told ETOnline.com: "I was really, really disappointed at him for being so horribly disrespectful and deceitful to do that in your own home. He can do whatever he wants in hotels on the road, whatever, knock yourself out, but you don't disrespect your family by doing it in your own home. To me it's just unthinkable.
"I would have chopped his willy (penis) off. Arnie's willy would have been down the disposal unit spinning around, that's where it'd be - and I'd make her clean it up. That mop would have been wrapped around her head."
Arnold - who has children Katherine, 21, Christina, 19, Patrick, 17 and Christopher, 13 - recently hired divorce lawyer Robert 'Bob' Kaufman to "move forward" with divorce proceedings with Maria.
It is thought any potential divorce could cost Arnold $200 million if the couple's assets - estimated between $200 million and $400 million - are divided evenly.