Finger (gesture)

In Western cultures, the finger (as in giving someone the finger) is a well-known obscene hand gesture made by extending the middle finger of the hand while bending the other fingers into the palm. A known variation includes extending the thumb as well. A variation of the gesture is also made by showing someone the back of the hand, with three fingers extended, and telling the recipient to "read between the lines". Another variation includes folding the ring and index fingers alongside the middle finger.

The gesture is also known as the "bird", "flipping the birdie", the "highway salute", "The New York Hello", "concert C", "sticking your middle finger up", "Showing Off Your Monkey", "The Canadian Turn Signal", and "flipping someone off". The gesture is mostly used as a non-verbal way of saying "fuck you". When both hands are used, it is known as the "double-barrel salute", the "double deuce", or the "dirty double". A more comical approach is to wiggle all five fingers and query, "Do you see these?" retracting all but the middle finger state, "Its a whole flock of these." (A distinct reference to the aforementioned "bird")

http://en.wikipedia.org/wiki/Finger_%28gesture%29