The first thing you should know about “A Bitchin’ Christmas,” the new single from Bitchin’ Kitchen’s Nadia G., is that it’s for a good cause: proceeds from the iTunes sales apparently go to Meals on Wheels, a worthy recipient if ever there was one. The second thing you should know is that it features guest raps from Ace of Cakes’ Duff Goldman, the Epic Meal Time crew and other demi-celebs from the weird and wonderful margins of food stardom. And the third thing? Red spandex. Lots and lots of red spandex. We’re not sure exactly who signed off on this, but there you go.