Everyone knows late defense attorney Robert Kardashian is Khloe Kardashian’s biological father -- or do they? Amber Rose unearthed an old rumor Monday when the ladies were in the midst of a fiery Twitter war. She claimed acquitted murderer and former professional football player O.J. Simpson is Kardashian's father.

“U think because ur dad was a professional football player that got away with murder ur better than me girl? Haaaaannnnn?” Rose wrote. The tweet was shared nearly 40,000 times and favorited more than 46,500 times.

But Rose wasn’t done there. “I'm so sick of these plastic a--h---- bullying ppl cuz they got the media outlets on payroll. S---s weak af,” she said. “I'm done dragging this b----. Lesson of the day children please don't try Muva cuz I will humble u.”

Rose’s nickname is Muva Rosebud, slang for mother, Rose Bud. She and estranged husband Wiz Khalifa share son Sebastian, 2, and Rose frequently likes to refer to herself as a MILF, a term popularized by “American Pie,” which means “Mother I’d Like to F---.”

Kardashian, 30, did not respond to Rose’s latest tirade after the model, 31, slammed her late Monday night. The two began a social media argument earlier in the day after Rose claimed in an interview with radio show “The Breakfast Club” Friday that Kylie Jenner, 17, was a “baby” and needs to “relax” from her rumored relationship with rapper Tyga.

Kardashian did not like her little sister being talked about in interviews, and took to Twitter to try to put Rose in her place. Instead, it was Rose who appeared to pull ahead in the unofficial battle and finished with the final word. It seemed to be Kardashian’s intention to get Rose to stop talking about her family, but instead Rose shared several Kardashian family and Kanye West themed messages.

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