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As the link in the comment indicates 小間物屋 is a vendor who sells a lot of things like cosmetics, everyday goods, etc. They often displays their goods in very spread out manner on a cloth (風呂敷). You can visualize it like thus:
The expression 小間物屋を開く is a euphemism for puking out so much stuff that it's like you are opening a 小間物屋 and displaying a wide variety ...
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