A person from Newcastle or the northeast of England, or the distinctive dialect spoken in that region.
Possibly derived from 'George' (a common name in the region) or from the phrase 'by God' in the local dialect. First recorded use in the 18th century as a regional identity marker.
Geordies have such a distinct accent and culture that they're instantly recognizable in British media, and their use of 'gan' instead of 'go' and unique vowel sounds preserve ancient Anglo-Saxon speech patterns that survived differently in northern England.
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