Slang Primer No. 9

Herewith the ninth in a series of entries on slang, this one drawn from Robert L. Chapman's marvelous "Dictionary of American Slang (Third Edition)."

IN LIKE FLYNN

Adjective phrase: By 1940s: Accepted; acceptable; belonging to a select group "Are you in or are you out right now?" "I'm in like Flynn. Didn't you notice the picture on my desk?" - Art Buchwald. [Origin uncertain; perhaps merely a rhyming phrase; perhaps associated with the sexual and other exploits of the actor Errol Flynn]