A nubnut is a person who is extremely awkward. They tend to create awkward silences, creep on attractive people, and do awkward things like save wrapping paper, keep endless amounts of paper bags in the backpack, drop glass bottles, and stare at blank walls. Many people gain amusement from a nubnut even if it is not the nubnut's goal. A nubnut can be a very lovable person, but usually they are clueless and cute. Friend a nubnut, they can always make you laugh.
"Woah, I can see messages in the clouds!"
"You're such a nubnut!"
Look at that girl saving her Christmas napkins in her lunchbox. What a nubnut!