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