Yankee Doodle

In particular the line; "Put a feather in his cap and called it macaroni"

There's some interesting history behind this song.

"'Yankee Doodle' is a well-known British song the origin of which dates back to the Seven Years War. It has been widely adopted in the United States and is often sung patriotically today. It is the state anthem of Connecticut."

Thank you Wikipedia: http://en.wikipedia.org/wiki/Yankee_Doodle