This song is about Kurt Cobain. It was first performed as "Dissed" and had different lyrics for the verse.
Courtney Love told Uncut Magazine: "I still don't understand why that one song with just three chords is such a big thing. But it's definitely got some good lyrics. That was a song about Kurt. I wrote it in Boston. So the line "dog beg," that's because there was a dog begging me for food." (Source Doll Parts…
I am doll eyes, doll mouth, doll legs
I am doll arms, big veins, dog beg
Yeah they really want you, they really want you, they really do
Yeah they really want you, they really want you, but I do too