A Rhino's Ass-end

I love creative ways of saying one's hungry. I think, right now and for quite some time, my favorite is:

I am so hungry, I could eat the ass-end out of a dead rhino.

I don't know why a rhino, let alone a dead one, but it informs the listener of the simple fact that the speaker is quite famished - in fact, very horribly famished.

What are some other good ones? Who has the 'diamond in the rough'?