When one unwittingly opens a Myspace page and is surprised by the music loaded onto the profile. This usually occurs when the subject's speakers are at an above normal volume, but wasn't previously listening to something. Often a furious and spastic search ensues to close the offending page.
In some cases, a Myspace profile will have more than one song loaded onto it. The resulting sound can be described as no less than an aural car accident.
I opened her myspace up and went back to finish the e-mail I was writing, only to have a good 20 seconds of Fall Out Boy at an earsplitting volume.
Cracker got Jambushed!