Y

Yankee
The origin is unknow but one theory holds that General James Wolfe (the battle hero of Quebec) used the word in a letter as a pejorative term for Americans. Another theory is that it comes from the Dutch "janke" which is a diminutive of the name Jan.

You are what you eat
What you eat determines how healthy of a person you are. So to be fit you must eat healthy. It was first used in the 1960's (during the hippy era). It originally referred to eating wholefood.

You Can't Take it With You
Also from the Bible, this saying originates from Paul's first letter to Timothy (I Tim 6:7), where he states, "For we have brought nothing into the world, and so we cannot take anything out of it. If we have food and covering, with these we shall be content."

Your name is mud
This idiom means 'you are not popular'. While escaping after shooting President Lincoln, John Wilkes Booth broke his leg. The doctor that gave him medical attention was Dr. Samuel Mudd. At the time, Mudd had no idea that Booth had committed the murder. Dr. Mudd was unfairly convicted of being a conspirator to Booth.