Smart and fashionable in appearance, or a British nickname for someone named Clark.
From British slang, 'nobby' likely derives from 'nob' (a slang term for a person of wealth or high social status, possibly from 'knob' meaning head). It became popular in British military slang in the late 1800s to describe smart or fashionable dress.
In British naval tradition, any sailor named Clark became 'Nobby Clark'—it's one of those mysterious rhyming slang traditions where certain surnames automatically got nicknames, and nobody quite remembers why it started, but it persisted for generations!
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