Food that you stocked up for when you get hungry and it's the last reliable source. Especially for when you're high, drunk, both, or just feel like a fat ass.
It usually tends to be snack food or junk food. Basically food you'd store up for the apocalypse.
Person 1: Dude, why are you getting so much food?
Person 2: It's my apocalypse food. Whenever there's an emergency, it's there.