Part one of a story

I read aloud a novel, "Dr Jekyll and Mr Hyde" aloud. There are several new words which I do not know. to need to study.Most of them I can understand,I can understand most of the sentences but a sentence I can't.there is one which confuses me.  "Mr. Utterson's best friend was a distant cousin called Richard Enfield, who was well known as a fun-loving 'man about town'." How can I comprehend.

"man about town" is a 花花公子

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