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

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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

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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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

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
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

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt