necrosynthesizer

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!"

necrosynthesizer by J.A.R. December 9, 2008