To have the absence of all common thought and to be so dorky one does not deserve to be called a dork, otherwise the word dork alone would not be able to fathom the dorktitude of the person.
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.