Mastermating
the act of having sex with your clone.
Boy: I was mastermating with my clone the other night after work.
by MaGar March 21, 2011
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Mastermate
A partner you have with you when masterbating. Also a typo for masterbate.
Wow, you would make an excellent mastermate.
by I believe its not butter. December 06, 2009
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