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WWE Hall of Famer Mick Foley DISGRACED HIMSELF at the biggest chicken wing competition in Philly Thursday night ... when he was caught cheating RED-HANDED and got booted from the contest.

Foley -- aka Mankind -- was competing against some of the best eaters in the country at Wing Bowl 23 at the Wells Fargo Center ... when officials says he tried to hide some of the wings in his fanny pack.

Foley disputed the allegations at first ... until officials played video footage on the big screen and he was kicked out for good.

As for the winner, Patrick Bertoletti upset Molly Schuyler -- one of the rising stars in competitive eating -- when he put down 444 wings in 26 minutes!!!!