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Joey Chestnut's losing streak goes way beyond competitive eating ... 'cause the ex-champ is revealing a major defeat he suffered in the bedroom -- and it's pretty nasty.

Joey joined #DateFails, a podcast co-hosted by comedians Stephen Kramer Glickman and Kate Quigley last week ... and to stay true to the name of the show, he let loose with a tale about about a 2009 hookup with a chick he met at a party -- hours after he was in a chili burrito competition.

You gotta hear the story, but fair warning ... it ends with him paying $600 for a cleanup crew in the woman's bedroom.