When you download music that says its one thing but really is something else. can also be used when someone adds words or lines into music
Dave: hey man, what is this shit?
Greg: i supposedly downloaded "i love college" but this sounds like...cher! its too horrible!!!
Dave: damn this is mushit!
Jenna: Yeah! this is great musi-
Song: Free ringtones! at www.myrings.com
Jenna: aww what mushit