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1.
"Rave" or form of wild dancing party where all of the members listen to music through headphones on seperate portable music players. The players are all synchronized so everyone is hearing the same thing, but no outsiders hear anything, hence the "silent" portion of the name.
The police didn't bust the silent rave down the street because nobody complained about the noise.
by TrueKore August 31, 2006
 
2.
"silent raving" aka the act of spontaneously raving to music played over headphones or total silence with a dash of lightswitch rave
"Yo dude, what's up?"

"Not to much to be honest, but seriously..."

"SILENT RAVE!"
by EggYokio March 30, 2006