A McBac is when you take the buns of the burger and replace them with cheese, and replace the meat of the burger with the bun, and the cheese with meat. The event upon consumption of the McBac involves the 3rd shrek movie being played backwards in the bottom of Jesus's Toilet while a school bus does barrel rolls on the Highway.
"Hey Nathan, try this McBac"

*Loud crunchy munching*

"Mmm... upon the consumption of the McBac, I noticed that for some reason, Jesus has a flatscreen tv in his toilet that seems to replay my favorite movie, while riding in a crackhead version of the magic school bus."

"So indeed it was mega tasty?"

"yes."
by McEnthusiasticCheese December 19, 2019
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