Different places have different meanings. If you are in Korea, turn your back to a girl and point your middle finger to the sky with your left hand. This is a way to show love, saying "I love you", love. The girl behind.
In many places, it is an insulting gesture, and the meaning is relatively uncivilized. Rude action.
For more than two thousand years the Romans have called the middle finger the "frivolous finger." In fact, the gesture of extending the middle finger alone does not mean a good thing in most countries in the world. It is generally used to express "disapproval", "dissatisfaction" or "curse".
In the United States, Australia, and Tunisia, this gesture means: having that kind of relationship is an insult. In France, it means dirty behavior. In Saudi Arabia, indicates bad behavior. In Singapore, it means insulting behavior. In the Philippines, it expresses curse, anger, hatred and contempt. In China, it means that the other party is "nonsense" or an insult to the other party. However, in Myanmar and Nigeria, extending the middle finger upward means "one", and in Tunisia it means "middle".