Plural or diminutive form referring to small goldfish or young goldfish, or a term of endearment.
From 'goldfinny' (variant of goldfish) + '-ies' (diminutive/plural suffix). This appears to be dialectal or informal British English rather than standard usage.
Diminutive plurals like 'goldfinnies' show how English speakers informalize language in intimate contexts—similar to how we say 'doggies' to children!
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