To besmirch the good name or good taste of a snack food; to take a sacred snack food and turn it into something it was never intended to be.
Tim: I've got nacho flavored popcorn at my desk, dudes. Check it out.
Kalu: No way, dude. That's just straight up snacrilege.
Tracey: Peanut M&M's are one thing, but Pretzel M&M's are just snacrilege!