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1.
the act of shaving with razor; not an electric shave
"Hey man, do you use Norelco?" "No way, I shave acoustic!"
by ExtraFine August 12, 2004
 
2.
Where one's singing shaves off one or many needed notes.
At karaoke, Jebus' acoustic shave of Born to be Wild really butchered the song.
by Jozef de Beer March 29, 2008