Ghost Ninja; to randomly disappear on your friends while out and about.
Where is James? I checked everywhere, no clue. He must have hit us with the ghost ninja. Again, he was just next to me, man he is slick.

Sorry guys I had to Ghost Ninja last night I had this girl I couldn't be seen with, but couldn't pass on either.
by ArJizzld July 2, 2010
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when someone goes into a dark room or area with intentions to have sex with someone (or otherwise cannot see their intended partner), then, after the sexual encounter, finds out they had sex with someone else without knowing it.
Melanie went into the room and thought she had sex with Chris. However, she really had sex with Lambert. Wow, Lambert did the ninja-ghost-sex move on her.
by Isauce August 21, 2006
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An elite squad of cowboy ninja ghosts that are masters at everything in all the universes especially at blanket throwing which is a very deadly skill
"Man hurry up! If we're gonna rob we have to do it fast before.........OH SH!T ITS THE BLANKET THROWING COWBOY NINJA GHOSTS RUN FOR YOUR LIVES AHHHHHHHHHHHH LAAAAAAAAAAAA (blanket throwing ninja ghosts easily destroy the robbers with their blankets in seconds leaving no evidence or trace of their exsistence there}
by btanket September 9, 2007
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