In good health or spirits; lively, cheerful, or in good condition; archaic British slang meaning 'fine' or 'excellent.'
From bob + -ish (adjectival suffix). The original sense may derive from the idea of bobbing or bouncing, implying liveliness and energy. This is primarily British dialect and has largely fallen out of modern use.
Bobbish is the kind of forgotten slang that shows up in old novels to mean 'feeling great'—it's the 19th-century equivalent of saying 'I'm vibing' or 'I'm feeling myself!'
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