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Eddie Griffin has stories for days about running with both Tupac and Biggie when they were still alive -- and he recently told a couple ... including one which ended with him having to strongarm some of Diddy 's merchandise!!!

The tenured comedian was signing autographs following a recent stand-up set in Atlanta when he was asked to travel down memory lane about hanging with the late great rap legends. Gallery Launch Gallery Getty

Eddie recalls rolling with Pac in the ATL area -- circa the time when the wild block party Freaknik was still a thing -- but it wasn't all fun and games ... Pac was hanging out the window double-fisted with both middle fingers out!!!

A couple of guys didn't take kindly to Pac's Thug Life gestures and a street fight b

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