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To detune a friends guitar to play a certain song but then not tune it back.
"Dude, i went to play my guitar last night only to find that Jeff changed every string to D. He totally fuck-tuned my guitar! How am i supposed to play this shit?"
by bassheads April 02, 2008
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A song that makes the listener want to do the do. Alternatively, a song to get dirty while listening to.
"At first he wasn't feeling it, but then I put on Passenger by Deftones and he was ready to get down. It's definitely my go-to fucktune."

"I have a playlist of fucktunes all set to go for when I bring a lady back to my place."
by libelicious November 03, 2014
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