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A person who calls to make sexual appointments.
In the lyrics to the song "Me so horny" by 2 Live Crew, MARQUIS is the one calling for a sexual favor:

Picked up the telephone and dialed the seven digits.
"Yo this is Marquis baby, are you down with it?"

Thus the saying MARQUISY was created
"She's SO MARQUISY right now"
by olk,jmnhgby April 23, 2008
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