It's time for "Giant Man Story Time" with NFL star D.J. Fluker ... who is about to tell TMZ Sports the true story of a guy who ate 65 Chick-fil-A nuggets only to lose a contest to a man WHO ATE 80.
Fluker -- 6'5 and 339-lbs for you scoring at home -- was out in L.A. when our camera guy asked him about the most fast food he's ever eaten in one sitting.
That's when "Giant Man Story Time" began -- with Fluker telling us he once bravely entered a chicken nugget eatin' contest and downed 65 mini-birds, but it wasn't enough to win.
Bonus -- He also tells us who the biggest eater in the NFL is.
Hint? He's bigger than you.