Snoop Dogg -- I Wrote a Porn Rap ... NOW LISTEN TO IT!!!

Snoop Dogg loves porn so much, he decided to express his feelings through song -- and TMZ has obtained the XXX hip hop homage ... even though we had to bleep about 96% of it.

The track appears on a porn called "The Flying Pink Pig" -- about a sex-crazed food truck staff ... which stars L.A.'s own famous "Flying Pig" taco truck.

If any of this sounds familiar, you might recall ... the owner of the "Flying Pig" threatened to sue the producer behind the XXX movie -- Erica McLean -- claiming she never told him the film contained hardcore sex.

Long story short, the lawsuit was never filed -- and Snoop had the opportunity to showcase his t****-rhyming talents ... a special favor for McLean, a close friend.