Top Definition
a DJ who jockeys MP3s instead of disks.
"Yo did you go to the party at the barn last night?"
"Yea man, Brett is an ill MP3J"
by jpjpjp December 22, 2008
3 more definitions
A DJ that plays exclusively from their laptop, iPod, or other electronic device.
Why is that MP3J calling himself a DJ, doesn't he know that DJ stands for Disc Jockey? Ya gotta play the wax!!
by rockin*Cat July 12, 2007
A music jockey who specializes in the presentation, mashing up, or other performance of electronically recorded files. Said jockeys may use prerecorded vinyl, cd or remixes from any source media, whether by themselves or others.
"That Mp3j really killed with that remix of the Stones and Beyonce. I can't believe he blended in Green Day and Bob Marley!"
by Franklin In San Diego March 24, 2010
Some cat who's either clearly not into hip-hop, buying records or is just a lazy bolix. Quite similiar to a DJ except with MP3s.
"Man, That MP3J was playing some pretty snip beatz last night and she was also a total lasher", recalled Phadraig.
by Jonny Tennant December 10, 2005

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