Plural of gibble; fragments or pieces; or third-person singular present tense of 'gibble' meaning to chop or fragment.
From 'gibble' (a variant of 'giblet' or to break apart), with the '-s' suffix creating a plural noun or verb form.
The word 'gibbles' shows how kitchen terminology is basically medieval butchery slang—when you buy a chicken with 'giblets,' you're literally buying pieces that medieval cooks called 'gibbles' because that's what they sounded like when they landed in the pot!
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