Very common message posted to messageboards.
Normally posted by a disgruntled
user when upset and wanting attention.
While someone who posts such a message
will sometimes mean it and
will never again go to that board after posting such a message, usually once they calm down, they'll come back and
will be posting as though they never posted it.
On some messageboards, such messages are so common and/or posted by certain users so much that people have learned to automatically ignore them.
I logged in this morning to find yet another I'm leaving the board forever message.
The guy that posted it has already posted
ten of them and returned less then twenty
four hours after each time.