It's not an acronym. To lop is to cut off. Used here to mean cut off 1 or more zeros from the currency--essentially a reverse split of the money supply.
Money is not a stock so it doesn't mean exactly the same thing it does in penny land, but the physical exchange is a major disruptive undertaking and it creates some chaos and uncertainty in the post-lop valuation of the money--which will interfere with business during the exchange period and can harm pre-exchange contracts.
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