Jap

''Jap'' is an English abbreviation of the word "Japanese". In some places, it is simply a contraction of the word and does not carry negative connotations, whereas in some other contexts it can be considered a slur.

In the United States, some Japanese Americans have come to find the term offensive because of the internment they had suffered during World War II. Before the attack on Pearl Harbor, ''Jap'' was not considered primarily offensive. However, following the bombing of Pearl Harbor and the Japanese declaration of war on the US, the term began to be used derogatorily, as anti-Japanese sentiment increased. During the war, signs using the epithet, with messages such as "No Japs Allowed", were hung in some businesses, with service denied to customers of Japanese descent. Provided by Wikipedia