Used to informally end a conversation that one finds uninteresting. It's politely used to feign enthusiasm about a subject in a one-sided conversation. When given the opportunity to respond, the phrase serves as closure to the topic in a neutral, non-committal way.
Woman 1: (Endess prattling about her son's hockey quarter-final playoff victory)... "And now they get a week off before the next game!"
Woman 2: (Stuck behind a retail counter) "Well, there you go!"