A myojine is an attention whore, often called that way on online game forums.
Likes to make things up to make him or herself more intresting while in the mean time making a fool out of him or herself. All the feedback he or she gets is good, it doesn't matter if it is positive or (mostly) negative.
Will put everything about their life (often non-fiction) on online forums in posts to try and make drama, also seen as a troll.
PersonA; Ugh, you saw that person posting that drama the whole time on the forums?
PersonB; Yea.. such a myojine.. Always trying to get attention.