Is the term used to describe someone, who often acts a little oddly with dumbed down behavior, they are quirky and fun and bring constant amuesment to other people.
Everybody loves a Derpnut and wouldn't have them any other way.
I myself, am a Derpnut and want this word to grow, show other Derpnut's, that we are awesome!
Person A "Ha, ha, ha. Ooooo, you're such a Derpnut"
Person B "Tehehe, yeah but you wouldn't have it any other way!"
Person A "Of corse not, you're the best Derpnut of all!"