Veteran rapper Talib Kweli was involved in a hellfire-heated exchange with security guards backstage at his Black Star concert last Saturday -- and TMZ Hip Hop has the explosive exchange all on tape!!!

The scene opens with Kweli barking at the top of his lungs at a group of men behind the curtain, demanding they tell him "Who the f*** they think they are!!!"

According to the sounds of the argument, Kweli was royally pissed off that security guards had walked onto the stage 1 minute past the 11PM curfew to stop the show, and was upping the bass in his voice towards anyone who tried to calm him down!!!

Kweli cursed out one stagehand to the point that the guy walked away with his tail tucked between his legs, as the onlookers cheered and jeered.

The BK rapper then turned his attention

See Full Page