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1. An ugly, twisted expression on one's face typically expressing disgust, pain or amusement while playing an instrument or vocalizing
2. One of the requirements for recruitment into a heavy metal rock band
"Tomorrow: Open audition for high-profit heavy metal rock band. Need to know three chords and be able to grimace musically"

"...and what the dickens is "grimace musically"?"
by Neenerdee October 14, 2013