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1.
n.
1. Elevator music
2. any generic commercially produced music for public establishments such as dentist offices and grocery stores, etc.
1. Dude, this musac is giving me a friggin headache, buy me an ipod, jeff.
2. Listenin to musac, hearing people scream, sittin in the waiting room reading crappy magazines (-Weird Al)
by J-rod January 26, 2005
 
2.
1.The really bad music that you hear in elavators(also suprising similar to porno music)

2.A word used in replacement for music to generally piss people off.
1.guy1-did you hear that lame musac in the eveavator?
guy2-yeah,it reminded me of a porno i watched last night

2.guy1-hey what musac are you listening to on your iPod?
guy2-Err dont you mean music?
guy1-yeah thats exactly what i said,musac!!
guy2-WHAT THE HELL ARE YOU TALKING ABOUT YOU MORON THE WORD IS MUSIC AND YOU ARE SAYING MUSAC
guy1-i have been saying music all along,you are the 1 who says musac i just wasn't gonna bring it up
by namorfa May 26, 2007
 
3.
stupid new zealand school administration software that is badly programmed and always crashes. Its really gay and they put updates out every other day.
Office Lady: "I can't get into Student Manager"
IT Guy: "That's MUSAC, Snakes on a plane... snakes on a mother fuckin' plane"
by musac August 30, 2006