Terrell Owens pulled off the impossible — keeping his cool like a boss while some disgruntled loudmouth hurled n-word after n-word at the NFL star.

It all went down in Miami earlier this month when T.O. was posing for pics with some female fans — and, according to one witness … the foul mouthed dude started popping off because he thought Terrell snubbed him.

Check out the altercation video: