1 definition by vandecou

Top Definition
The undercover love interest of a man who is engaging another woman outside his marriage or relationship. To his wife or girlfriend, this extra girl is a friend, when the truth is he and this "play sister" may have been intimate in the past, but the relationship did not work out.
She's just my play sister - there is nothing up between her and I.
by vandecou December 19, 2012

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