noun
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 metalrock band. Need to know three chords and be able to grimace musically"
(v.) the act of strutting around randomly, often times in another person's house, dancing and singing to the high school musicalsoundtrack. (often not very good.)
Riley went to Carina's house, who had put on the sound track from the movie, and they were high school musicaling all day.
Riley almost lost her limbs from high school musicaling.