A word that highly skilled internet commenters post on internet message boards to show their superior skills at being the first to comment on an article, blogpost or other internet forum. Typically these people are highly skilled and successful individuals that are irresistible to members of the opposite sex.
Ian21 is always getting first on message boards, he is so cool, he owns PWE.
SPAM commenting on anything with the incorrect assumption you are the first to contribute. Only comments which refer in some way to the subject commented on are real first comments. In other words it isn't a first post solely to add the word first.