UFC badass Polyana "Iron Lady" Viana is telling TMZ Sports exactly how she disarmed and throttled a man who was allegedly trying to rob her at gunpoint ... and it's VIOLENT.
Dana White has already heaped praise on Viana -- a 26-year-old fighter with a 10-2 pro MMA record -- but now, she's giving us the blow-by-blow herself.
It all went on Saturday night when she was approached by a man outside of her Rio de Janeiro apartment. Viana claims he pulled out something claiming to be a gun and demanded her cell phone.