The government of the United States of America. A reference to "Uncle Sam," a personification of the United States or its government that is typically shown to be an older man with a long grey goatee wearing the stars and stripes of the American flag on his clothes and top hat. I don't own a cell phone, and I try not to use a computer if I can help it—don't want Mr. Whiskers watching and listening to everything I do. I suggest you pay your taxes on time and in full, unless you want old Mr. Whiskers knocking on your door in the future.