A song that you don't particularly like but "follows" you and plays everywhere you go.
"Dude, don't you like that song 'Boom Boom Pow'?"
"No, that's my stalker song."
A song that is on your iPod, that you don't actually like that much. When your music is on shuffle, it always pops up and plays; as if it's a stalker.
Man, I was listening to my iPod and that Jonas Brother song kept playing. I really need to delete it from my playlist. It's such a stalker song.