Expressions from "riffraff" to "betting your bottom dollar", "passing the buck," "acid test" and even "heard it through the grapevine" all come from America's frontier days. But have you ever wondered why these phrases were first used and what they mean today? The answers reveal the hidden history behind America and its secret slang.

Americans have always loved to eat and expressions relating to food--from New York's "big apple" to "wake up and smell the coffee" --pepper our everyday speech. But where did they all come from? For example, why is something that's as "easy as pie" considered "a piece of cake?" Or why do you "talk turkey" about quitting a bad habit "cold turkey?" And what does it really mean to "bring home the bacon"? The answers reveal the hidden history behind America's food and its secret slang.