The modifier lamming or lammin’, is used as an intensifier, as in “That container is lammin’ full,” meaning “That container is extremely full.” There’s a whole class of intensifying words like this in English, which have to do with the idea of hitting, banging, thumping, or striking. Another example: larrupin’. The word lammin’ in particular popped up in a bunch of cowboy novels after Zane Grey popularized the term in his books. This is part of a complete episode.

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