a man who has an ongoing affair with another person outside of a relationship in return for financial support from this person, a male mistress
"his girlfriend suspected he was a misteress to another woman when she surprised him at work to thank him for her new bling only to find out he had been fired months previously."

"he found out that his mistress was actually a misteress in a very unpleasant fashion"
by burkielicious February 15, 2007
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Noun. A male version of a mistress. A man having an extramarital sexual relationship, especially with a married woman.
Her mister-ess was patiently waiting in his car to go out with her. She knew she wasn’t going to pay anything for the dinner. The mister-ess took her back home and gave her a doggie bag to give to her kids at home.
by venomfactor13 September 12, 2019
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