[Smithy]

Chad Johnson's ready to unleash his Johnson ... he says he's going into porn.

The 'Bachelorette' bad boy tells TMZ ... he's moving to Sin City soon to buy a house and build his own porn studio. As for who he's partnering up to do all this with ... the ex-GF he claimed last month tried ruining his life, Annalise Mishler

Chad tells us he's moving to Vegas in a month or so as soon as he finds a huge house there. He says it's way easier and more affordable to fly people into Vegas where he'll have lots of bedrooms and a studio room for others looking to get into OnlyFans-style content.

Chad, as we told you last month, pimped his OnlyFans account when we wanted to get a straight answer whether he's back with Annalise or not after all their drama