LMAO! MIKE EPPS RELEASED FIST OF FURY ON A PAPARAZZI THAT WAS HECKLING HIM!

Mike Epps unleashed a fist of fury last weekend ... socking a photographer who was allegedly harassing the comedian during a party for Mike's wife -- and a HUGE brawl broke out!!!
It all went down at the Key Club in Detroit last Saturday (11/27) -- Epps tells us the photog was talking trash to him and his wife while filming them inside the restaurant ... and Day-Day snapped.

Epps -- who played the "wrong Doug" in "The Hangover" -- can be seen throwing one haymaker as security instantly swarmed in to break up the melee.

Epps tells TMZ, "It was a private celebration for my wife's birthday. I asked the photographer numerous times not to film, but he refused to let up. I then attempted to retrieve the tape from the camera."

Attempts to reach the photographer -- who was escorted out of the restaurant post-beatdown -- were unsuccessful.

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