Quinton "Rampage" Jackson said his son was back home and "doing OK" hours after he was booked for felony battery on Thursday ... telling his buddies he's well aware of the fact Raja "f***ed up."
Rampage went live on Kick following the 25-year-old's arrest ... and at one point, he opened up on the aftermath of the Knokx Pro Wrestling scandal that left Syko Stu (aka Stuart Smith) hospitalized.
"I'm doing OK, I'm holding up well," Rampage said .