derived from the word fantastic, something that is so nerdy it is cool, would be considered nerdtastic.

When you eat dirt for the first time and leave your family to build a shack in the woods

Adj - A mix between nerdy and fantastic.

A person who's finer qualities may be termed - 'nerdy' (see nerd) - but instead make them a more fun person to be around. Often used teasingly.

Often used specifically in reference to 'band nerds' and 'theatre nerds' by other band and/or theatre nerds.

Something generally not cool, but to a nerd its fucking fantastic

noun = a nerd who is a fantastic person or who does fantastic things.