Having a mouth that is large or prominent, or in British slang, someone who talks a lot or is mouthy.
From 'gob' (British slang for mouth), derived from Irish/Gaelic 'gob' meaning beak or mouth, with the suffix '-y' meaning having the quality of.
The word 'gobby' shows how slang spreads across regions—it's primarily British and Irish, yet perfectly describes someone who can't keep quiet, as if their prominent mouth is always working!
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