The Hall of Famer was chilling in the JSU facility when Sam handed over some massive rubber feet ... which featured veins to make 'em look real.
Sanders -- who had two toes cut off earlier this year -- didn't get pissed about the personal jab ... instead, he laughed it off and said, "I like that!!
"Y'all got jokes!! Thank you. I really feel complete now."
But, Sam better watch his back ... Sanders clapped back, "I'mma kick some butt today, starting off with you Sam."
As for the color of the feet -- Sam says Deion had previously joked he wanted two white prosthetic toes .