Not quite real life because it's more of general stereotypes, but stoners frequently eat pizza (specifically Domino's), and college students favor Taco Bell. These came from somewhat possible origins, Domino's delivers and Taco Bell is some of the cheapest food available.
Tabletop gamers, similarly, have Cheetos, Mountain Dew, and Twinkies.
The Mountain Dew has a logical reason: it provides caffeine without the time and equipment needed to make coffee.
Energy drinks such as Red Bull, V and Jolt Cola also count.
A stoner's favorite food is whatever's handy.
A stereotypical example of a "stoner's favourite food" are funyuns. Expect most jokes referring to stoners made on late night talk shows to include a mention of the snack.
One of the effects of marijuana is the rise of serotonin levels in your brain, making you feel hungry and enhancing your sense of taste, so pretty much anything with a lot of flavor, especially sweet or salty snacks, is most sought after by those of a stoned persuasion. Even something as bland as celery tastes good when you're stoned.
Everything tastes good when you're stoned. Even most of the foods you don't like.
Contrary to popular belief, although rabbits do like carrots, the food they will actually go nuts for the most is bananas. Don't give them too much of either, however—they get bunny diabetes.
Likewise with mice and peanut butter.
Order the same thing from a restaurant every day (or as good as). They soon associate you with that food.