1. Buying some sugary abomination, usually from a vending machine.
2. Eating something that your posse would normally consider un-cool.
I committed an act of gross snackrilege today: I secretly bought a bag of Gummy Bears from the vending machine and ate them all.
The act of consciously defaming tasty party snacks.
Person 1: Hey dude, wanna triscuit?
Person 2: God no, triscuits taste like week old ass.
Person 1: Bite your tongue blasphemer, I will not stand for such snackrilege!
Person 2: *flips bird*