Top Definition
noun-slang a synthesizer that is preset to play background music for any death-metal band

the prefix "necro-" meaning death
the word "synthesizer" meaning an electronic keyboard with many different tone variations
Guy- "Hey, did you see that necrosynthesizer that one bald dude was playing in the band?"
Girl- "Yeah, he was playing some sick chords!"
by J.A.R. December 27, 2006
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