Blac Chyna has gone all high school on Kylie Jenner, posting a cartoonish pic of herself mocking the lip challenge of her nemesis.
Tyga must be chuckling ... his baby mama and current "girlfriend" embroiled in a lip lock.
But maybe it's Blac Chyna who wins this one. She posted a pic of wax lips -- same as what she's wearing in the photo -- which she says she'll be hawking on her fashion line website.
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