Lyric discussion by TheSilverNoble 

My sister likes to sing "big suburban" rather than Beast of Burden.

Anyway, I think, like some people said, he's getting a little frusterated with how things are with this girl. So now he's saying he's not gonna be her beast of burden- a very clear image, even if it could mean a number of things- though he probably will, in the end. He's just being more frank at the moment. And he probably does care about her, too. Like I say, he's frusterated in this song- in several ways.

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