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slang term for mp3, the file extension for MPEG Audio Layer-3, a compressed sound file favored for its relatively smaller file size compared to a 44.1khz, 16bit "cd-quality" .wav file.
That track sounds like crap because you downloaded the mpfree. If you want to hear it properly you should buy it on vinyl.
by Stephen Ganser December 12, 2008
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An MP3 that is given freely or made freely accesible on the internet.

The phrase was first coined in the band Pomplamoose's 2009 Holiday Youtube video.
"Pomplamoose is offering MP3s for free if you buy and give a goat. They're MPFrees!"
by youtubermusic December 17, 2009
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