One who seldom or never shows him/herself on MSN by appearing offline. MSN Ninja's are very selective of who they choose to be seen by, and just like a ninja, can disappear just as easily as they appear.
Super Ninja Secret (Adj.) a. To describe a secret that is ultimately THE SECRET that no one knows about or ever will. b. A secret that you can't even tell your bestest friend, or anyone for the fear it would get out. c. A secret that you can't tell no matter what. d. the secret your mother warned you about. e. when someone says they would have to kill you if they told you...yeah, that's a super ninja secret!
"OOOHHH yeah.....that secret....it's a Super ninja secret... I can't tell you!"
The best way to have sex, is still a super ninja secret.