Chrisean Rock is flipping the bird to anyone who thinks she should dump Blueface after his arrest for attempted murder ... and she just might prove her loyalty with some fresh ink.

Chrisean got pissed off while Live on social media addressing Blueface's Las Vegas bust -- a number of people suggested she save herself, but CR wasn't having it! She pointed out Blueface never turned his back on her when she was locked up.

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