1. slang A person who is very interested in extremely unfashionable, unsophisticated, or uncool things; a very geeky or nerdy person. Once a month, I host a weekend party where megadorks from all over campus come together to talk about everything from Dungeons & Dragons to video games to anime! I was such a megadork in high school, but I had some really great friends who shared the same interests, and no one really bullied us or anything.
2. slang An extremely oafish, dimwitted, or inept person. Why would you let a megadork like Rich handle the account? He's just going to screw it up like he always does!
n. a very stupid person. (see also dork.) Tiffany, you are, like, such a megadork!