The term net.goth was coined as a joke by Sexbat, in a posting to the 
alt.gothic newsgroup.  A modern definition for the term could be as 
follows:

    *net.goth* /net goth/  noun.  *1.* a poster to alt.gothic,
      uk.people.gothic or other goth-related newsgroup.  *2.* any
      goth with a presence on the Internet.  [Usenet: see net dot
      prefix, net.god, net.personality, etc.]

Incidentally, visit Sexbat's website at <http://www.cydhe.com/> if you 
are interested in the Tao of Goth or other mysterious writings.