In a manner characteristic of or befitting a gimmer; with the qualities associated with young female sheep.
Gimmer + -ing + -ly suffix stack. The adverbial form created by adding -ly to the adjective form gimmeringly (or adverbializing gimmer directly).
This wonderfully obscure adverb shows how English farming dialect creates layers of specificity—when you can describe something as happening 'gimmeringly,' you're really capturing rural life details!
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