One who lounges; that is, frequents cocktail lounges and indulges in classic vices reminescent of an earlier time in American history: those of music, cocktails, fashion, flirting, and all manners of witty conversation.
That sharp gent over there smoking a Churchill and sipping a Sidecar? Great conversation sure, but don't ask him to dance — he's a lounger.
one who lounges
a lounger just sat on my couch