Someone offered a free burrito but when I took it from the freezer it had long dark hairs wrapped in and around it so how could that occur?

Oh, you won't eat the hair out of your burrito, but you'll suck a worm from a bottle of tokillya? :P

not sure

Was it actually hair or some sort of fungus?

Though if it was hair I'd assume you'd have seen it before storing the food, unless it was in a box.

Well, whatever it was I wouldn't have eaten it either!