Whoa; it's going DOWN!

Kris Jenner says she's "dunzo" with ex-husband Caitlyn Jenner after the transgender Olympian wrote her tell-all and dished some pretty nasty dirt about her family.

In The Secrets of My Life, Caitlyn writes of Kris, in Kris' own words, "I read it and basically the only nice thing she had to say was that I was great socially at a party one time ... And then, all through the book, 'Kris knew. Kris knew before I even made love to her.' I'm like, 'What?"

Kim supports her mom, saying Caitlyn, then Bruce, was married to Kris longer than any of his other wives and that it doesn't add up. The family's upset because Caitlyn didn't come to them first to discuss what she was going to put in the book -- just as she didn't with her explosive Vanity Fair article after she first transitioned -- and now feelings are getting hurt and maybe worse. Relationships are unraveling.

Kris says to Kim in this sneak peek from an upcoming episode of Keeping Up With the Kardashians: "None of it makes sense. Everything she says is all made up. Why does everything have to be that Kris is such a bitch and an a--hole?"

Khloe listens but doesn't participate in the conversation, at least not in this clip. She's been closer to Cait and has tried to be understanding of the situation -- does her silence mean she supports her dad and doesn't want to sit around sh*t-talking? Well that's not how Kris feels! The clip ends with her saying, "I've never been so angry and disappointed in somebody in my whole life. I'm not gonna be used as a person who benefits someone else's life just to make them look better. I just can't sit back and be an enabler anymore."

A million years ago with Ryan Seacrest launched KUWTK as the show's creator/producer, we bet her NEVER imagined the craziness that would go down in this family's real-life drama! Who would have predicted THIS!