In a manner that gouges or scoops out; in a way that exploits or takes unfair advantage.
From 'gouge' plus '-ing' plus the adverbial suffix '-ly.' This is a rare construction, formed by adding '-ly' to the present participle to create an adverbial form describing the manner of gouging.
This is a word so rare that most English speakers have never encountered it—it's technically correct but almost never used, making it a perfect example of how English allows infinite word creation even when practical speakers ignore the possibilities.
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