A sandwich consisting of copious amounts of Nutella and Peanut Butter between two slices of white bread.
It is named such as it will provide one with enough energy to supply a small town but will inevitably lead to a complete sugar crash after an hour.
Mikey: "Dude, I just had a Chernobyl Sandwich and it is the bomb! I just deep-cleaned my house, asked out three women, went skiing, went surfing, cooked a five course dinner and... uhhhhhhhhh..."
David: "What the fuck?"
Mikey: *unintelligible noises similar to a brain-dead chimpanzee*