That's hip-hop star turned bare-knuckle boxer (yes, you read that right) talking about why he decided to take a real-deal fight -- NO gloves -- later this summer.

Blueface joined "TMZ Live" and made the blockbuster announcement ... revealing he will make his BKFC debut on July 23.

FYI, Bare Knuckle Fighting Championship is the most popular bare-knuckle fighting org ... with people like Paige VanZant and Paulie Malignaggi mixing it up in their cage.

It's unclear who Blueface will take on ... but he says it'll likely be another celeb.

"I'm pretty sure it's either gonna be some type of YouTube or TikTok-er or something of that nature," Blueface says.

And, even though the "Thotiana" star doesn't have a traditional boxing background ... don't think he isn't taking the fight seriously.

"I've only been eating grilled and baked stuff lately. Yeah, I'm on a diet and everything. I ain't been smoking, drinking, nothing."

Of course, celebrities and social media stars fighting (Jake & Logan Paul, Bryce Hall, etc.) has become all the rage lately ... something Blueface believes he helped start.

"I don't know if you guys seen but me and YK Osiris was actually boxing in the backyard for fun, kicks and giggles, and that's really how all of this celebrity boxing came about, in my opinion."