Idiom: Where's the beef?, What's the beef?

Ⅰ. 자료: American Heritage Dictionary of Idioms, http://www.answers.com/topic/where-s-the-beef

Idioms:  where's the beef?

1.  Also, what's the beef? What is the source of a complaint, as in:

• Where's the beef? No one was hurt in the accident. 

This usage employs beef in the sense of a "complaint" or "grudge," also appearing in the phrase:

• have no beef with, meaning "have no quarrel with." [Slang; late 1800s] 
  

2.  Where is the content or substance, as in:

• That was a very articulate speech, but where's the beef? 

This usage was originally the slogan for a television commercial for a hamburger chain attacking the poor quality of rival chains. (1984) The phrase was almost immediately transferred to other kinds of substance, especially in politics. 

Ⅱ. 자료: Cambridge International Dictionary of Idioms,  http://idioms.thefreedictionary.com/beef

Where's the beef? (American, informal)

something that you say when you think someone does not have enough ideas to make their plans work. 

• Where's the beef? The Senator has no new political initiatives or ideas.

Ⅲ. 자료: http://www.answers.com/topic/where-s-the-beef

Wikipedia: Where's the beef?

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The picture sleeve of a "Where's the Beef" single, recorded by Coyote McCloudand Clara Peller, based on her legendary advertisement

"Where's the beef?" is a catch phrase best known in the United States and Canada. Since it was first used, it has become an all-purpose phrase questioning the substance of an idea, event or product.

It came to public attention in a 1980s US television commercialcreated by Joe Sedelmaier as part of Dancer, Fitzgerald, Sample'sfast food advertising campaign for the Wendy's chain ofhamburger restaurants. In the ad, titled "Fluffy Bun", elderly actress Clara Peller receives a competitor's burger with a massive bun (the competitor's slogan was "Home of the Big Bun"). The small patty prompts the gruff Peller to angrily exclaim "Where's the beef?" The humorous ad and Peller's memorable character soon gave the catch-phrase a life of its own, and it was repeated in countless TV shows, films, magazines, and other media outlets. .....