When you are engaging in sexual conduct, preferably doggie-style, and you throw your hands in the air in celebration, thus making it hands-free.
Justin was bluetooth-fucking that girl.
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Bluetooth fuck is a sexual act between two people who are far from each other. It involves one party fantasizing about the other party while wanking. Both males and females engage in Bluetooth fuck.
Dude, yesterday I slept late, I had a multiple Bluetooth fuck with Cindy, the most popular chick in school.