This is not a common saying, as far as I know, though others may have heard it. In fact I find it rather curious. It would help if you would tell us where you heard it. It seems likely that was created on the spot to suit the context.
I've heard of a chocolate teapot, Latenight. It's about as much use as a chocolate teapot = It's absolutely useless ~ if you put boiling water in a teapot made of chocolate, it would just melt.
But we really need to see your context.