[Gugel]

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But it doesn't make sense to think of it from outside or on the edge of the point.

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How useful is the big bang metaphor then? What does it mean?

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Perhaps a more useful way to visualize it would be stripping the current Universe of everything (matter, energy, dark energy, dark matter). Then imagine huge tears throughout the Universe (every single nook and cranny of it) spewing forth massive amounts of energy. It's rapidly expanding and cooling over time and eventually, it's cool enough for matter to form.