Every new message board post is on some topic. So posting a new topic declaring it as being 'off topic' makes no sense. If you are responding to a post or diary with content that differs from that of the original content, then yes, that is 'off topic'.
So stop being stupid.
That is all.
"Rodrick Williams Jr.'s 10-month old, 2-foot-long savannah monitor named "Kill" gets the RB some strange looks when they go for walks together."