This is what it says on Wikipedia:
Tunstall expanded on the song to M Is For Music: "The song is about when I met someone who had a really negative effect on me, and even though they were still alive, I experienced these almost visitation-like hauntings that I couldn't shake off. I took to wearing a t-shirt with the person's name on to try and exorcise them, which finally worked."
That explains the like a ghost part.
Also, I'm convinced it's "Got your head swinging, your snake head swinging" rather than hips. But I don't know!
This is what it says on Wikipedia: Tunstall expanded on the song to M Is For Music: "The song is about when I met someone who had a really negative effect on me, and even though they were still alive, I experienced these almost visitation-like hauntings that I couldn't shake off. I took to wearing a t-shirt with the person's name on to try and exorcise them, which finally worked."
That explains the like a ghost part. Also, I'm convinced it's "Got your head swinging, your snake head swinging" rather than hips. But I don't know!