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1.
Name of a musical genre, created by the UK electronic music label Rephlex Records in the 90's, in this time is when the term IDM also appears.

Braindance is electronic experimental music mostly, there are included drill n' bass, acid house, future lounge, electro and some other weird electronic music.

Big and influential electronic music artists such as µ-Ziq, Squarepusher, AFX, Luke Vibert, started under the braindance file.
braindance is... incredible! braindance is... boundless; eclectic; entertaining; rephreshing; fullfilling; wholehearted; sensual; stimulating; bold; unconventional; real, imaginary; visionary; essential; debonair... BRAINDANCE is unique!
by Neto May 27, 2004
 
2.
The process where a male puls his testicle and dangles it just over the top of his trousers so it looks like a brain. then the mail raves around the room. also brains can be used to describe a testicle.
Wow me nd the lads were having a Brain Dance round the room last nyt!

I was walking round last nyt with my brains out.
by Potty October 10, 2007