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A wildly popular comedian made some waves online on Tuesday ... when he revealed he dressed up as a stabbed Mark Sanchez for a Halloween party.

Benedict Polizzi -- an "FBoy Island" star who boasts 3.7 million followers on TikTok -- shared the 'fit on his Instagram page ... and it raised more than a few eyebrows.

Check it out -- Polizzi donned a No. 6 Sanchez Jets jersey ... complete with fake blood splattered all over his torso. He adorned the costume with some football pads, a pigskin and eye black.

Most of Polizzi's fans found it humorous -- though it goes without saying, Sanchez supporters sure didn't. Play video content

The former NFL signal-caller, as you know, almost died when he was slashed near his rib cage during an alleged Oct. 4 fight with a delive

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