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A person who acts as an intermediary in group sex. allowing a person to to be in a sexual act with another person without being in physical contact with them.
"I slept with Karen last night!"
"Dude, isn't she a lesbian?"
"I used Jessica as a fuck-buffer."

"I heard you were at Mike's orgy last night. Doesn't he have the clap?"
"Yeah, but I used Lillith as a fuck-buffer so it's all good"
by DJBarenJuden April 05, 2012
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