Flesh-N-Bone -- I Want to Expand My WEED Business

Flesh-N-Bone is hoping to smoke the competition in the weed biz ... 'cause the Bone Thugs-N-Harmony rapper claims he's created his own unique strain of cannabis and he's now trying to get it in pot shops across the country.

Flesh -- who happens to be an avid ganja enthusiast -- has named his new creation "Phifty Caliber Kush" ... and says the strain was created to help with pain relief.

A rep for the rapper tells TMZ ... Flesh has already signed a deal to sell PCK at a dispensary in Flint, MI ... and hopes to expand to California, Colorado and Washington in the near future.

Flesh isn't just selling the bud -- he's also selling the seeds ... hoping people in the stoney crowd can pull themselves away from The Cartoon Network long enough to grow their own stuff.

Gotta get that money man ...