"I'ma f**kin' eat this man alive."
That's what "Platinum" Mike Perry promises to do to Donald "Cowboy" Cerrone when they square off at UFC Fight Night 139 Saturday night.
Perry didn't stop there ... telling TMZ Sports, "I'm gonna knock this man the f**k out, period. That's all there is to it."
"I gotta take over. I'm gonna go forward, push him in the wall. Grind my elbows in his face. Slice his face open, and knock him out cold."
Cerrone ain't the only one feelin' Platinum Mike's wrath .