A song that is unique to every individual - a song that speaks about your personality and makes you want to get your groove on. Yes, I said get your groove on. A particular theme song is one that makes the person feel amazing when it is played.
Andrea: My theme song is Lady Gaga's Just Dance. Pretty awesome, just like me.
Holly: Into the NIghtlife by Cyndi Lauper!!!!
Things that exist or were invented or created at different times by different people but none-the-less, go perfectly together.
Gal Drinking a Latte: Dude, coffee is my fucking theme song.
Guy one: I think I found a girl i'm finally happy with.
Guy two: sounds like she's your theme song man.