Octomom to NueveMom -- 'No One Will Ever Take My Octo Title'

Octomom Nadya Suleman has a competitive uterus ... because she doesn't want any would-be baby machines taking a shot at her birthing title ... and she's sick of them trying.

Octo had some competition recently from Mexico's NueveMom -- who claimed to be pregnant with 9 babies. Her story might not be true, but if it is ... it could have shot Octo's record for most children delivered at a single birth to survive straight out the window.

Octo tells TMZ she's tired of all the Octofakes lately, telling us, "No one will ever take my Octo title, I’m in the Guinness Book Of World Records!"

She goes on to call NueveMom "a fraud" and says she "shouldn't be making a joke about raising a large family. It’s a serious job and takes a lot to take care of my children. She disgusts me."