Miley Cyrus -- I Got My Pet Pig Hookup From the King of Fake Teeth

Miley Cyrus's business deal with the king of fake buckteeth really helped her bring home the bacon -- as in her pet piglet Bubba Sue.

TMZ has learned the micro pig Miley's been showing off in pics since August ... was a gift from her business partners at Billy Bob Products -- the company that just started cranking out those ridiculously popular Miley Bob fake teeth for $11.99 a pop.

Billy Bob founder Jonah White tells us he and his wife reached out to Miley back in August ... after her dog Floyd died, and set up a backstage meeting in St. Louis. He says that's when they surprised her with Bubba Sue -- complete with a birth certificate.

Around the same time ... Jonah and Miley also hammered out their business deal. Sources close to the negotiations tell us Miley is getting a 50/50 split of the profits from her line of fake teeth.

Sweet deal, sweet pig.