whale n. a large man-made snow mound. Editorial Note: Usually resulting from a commercial snow-grooming machinery typical of a ski resort. Etymological Note: So-called because of their large, round shape and perhaps influenced by “whale” meaning “a large or significant example of a particular thing,” as in “I have a whale of a headache.” (source: Double-Tongued Dictionary)
Further reading
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I would imagine that the snow color helping the mound look like a great white whale (Moby Dick) has something to do with it too.