Luis Pena's girlfriend claims the UFC fighter, known by man fans as "Violent Bob Ross," choked and punched her in the face before being arrested for domestic violence ... in a 911 call obtained by TMZ Sports.
"I wasn't trying to snitch, but since my boyfriend wants to be an asshole, he put his hands on me, and he's got to go," Pena's GF told an emergency dispatcher.
28-year-old Pena -- 9-3 in professional MMA (5-3 in the UFC) -- was arrested Saturday in Broward County, Florida after allegedly getting physical with his girlfriend.