MYSTIKAL SAYS IF HE DOESN'T GET ANOTHER HIT HE'S DOING PORN WITH PINKY!

Mystikal is giving music one last shot -- but tells TMZ, if he fails to make another hit on his next album ... HE'S TURNING TO PORN.

This is not a joke. Mystikal tells us, he needs to make sure the money keeps coming in ... and if there's one thing he's good at, it's having filthy sex. So porn is his plan b.

Which is either crazy ... or perfect -- because Mystikal served SIX YEARS in prison for sexual battery beginning in 2004 after forcing his hairstylist to perform sex acts on him.

But Mystikal is undeterred, telling TMZ he already has a history in porn -- winning an AVN award in 2003 for an adult movie he made (he doesn't actually have sex in it though).

TMZ asked Mystikal who he'd want to star in his first skin flick, and the rapper said Pinky -- adding, "She's a bad bitch. I would take her down in a second."

As for whether he's got the requisite hardware to be a male porn star, Mystikal wouldn't give an exact size, but said, "I'm definitely the man, the myth, and the legend."

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