The "Jap Slap", as it has come to be called, is a constant. The Jap Slap IS, WAS, and ALWAYS SHALL BE. the Jap Slap, as most generally described, is the instinctual need to palm-hand someone. The name Jap Slap came to be right after the second world war. The world came to appreciate the Jap Slap as a fine art mastered by the Japanese.

To Jap Slap someone, is to slap them when they are not aware of the incomming slap. (I.E Sneak attack)

Comes from when the Japanese bombed Pearl Habor in sneak attack fashion.

A highly technical, extremely dangerous martial arts move in which the individual performing the act strikes their victim with one side of their open hand, then immediately reverses the course and brings the other side of their hand accross the victims face.

Against political correctness, it really means to be hit with the back of the hand. Now its known as a pimp slap by yuppies trying to be urban

To slap someone so hard they become slant eyed.

In WWII the japenese use to slap P.O.W's execively as a means of interagateing their suspects. So, the term Jap Slap became popular in that era just as a reference to slapping someone.

When a person is slapped twice across the face, and the repercussions are equivalent to that of two atomic bombs- Hiroshima and Nagasaki style!