It means it's someone who has a very similar music taste to your music taste.
It can also be used sarcastically when someone has a very different music taste then you.
And also that that's your buddy who you like to listen to music with.
Alex:I wish I had a DJbro but everyone has a different music taste than me:(
Alex 2.0:Yeah that's because your music taste sucks..
Alex:IT DOES NOT
Alex 2.0:Then why don't you have a DJbro?
Alex:ughhhh..idk..
by Cloverkittynah July 18, 2021
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