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One who uses his/her mouth to please/motivate as in sexually
(Though if you are not using it as an innuendo, it is a legitimate phrase for a good public speaker)
Guy: "I've heard she goes down on guys a lot. I bet she's a great oral motivator."

Guy: "Ugh she's such a slut. But really all she is is an oral motivator so she doesn't have to worry about being safe."
by Morgan T.L. February 08, 2008
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