Queen of Spades - a woman, usually married, who has frequent sex with endowed black men on the side, with her husband or boyfriend's permission.
Don't worry about my husband, I'm a QOS so I'll leave him here at the bar while you and your friend take me to your hotel room.
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The act of leaving your boyfriend or husband while at a public venue such as a club or bar to go fuck a stranger you met and then return to your husband or boyfriend at that same venue a short time later.
Don't worry about my husband, he'll wait here patiently for me while I go flinging.
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