Top Definition
A Menage a Trois where one of the people involved is not aware of it being a three-way. More points are awarded the longer the "victim" is kept unawares of the third party.
"Were you at the party last night? Steve and Rob ended up in a Phantom Menage with Cindy! you should have heard her freak when she found out!"
by Bone Stoner December 19, 2009
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