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The female form of a master.
by Joan-Marie August 06, 2008
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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When a gay man is in a long-term stable relationship with a partner, yet keeps a bit on the side, the bit on the side is termed the masteress. In principle, it is the same as a straight man having a mistress.
Mike was going out with Tom, but he kept Dimi as a masteress on the side.
by becy August 11, 2005
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Golden Shower Plush

He's warmer than you think.

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