Gook (/ˈɡuːk/ or /ˈɡʊk/) is a racial slur for East Asians and Southeast Asians in English.
The word's origin is unclear. It is said that American troops in the Philippine–American War (1899 – 1913) started using it, which later became a word for "dark-skinned foreigner, especially a non-European or non-American" in general.
The word began to be used for referring to Koreans in the Korean War (1950 – 1953), despite South Korea's protection by the US-led United Nations Command. Historians said that the use might come from the frequent local use of the Korean word 국 (guk), meaning "country", which was mistaken by American troops for how Koreans called themselves. The word was reportedly so common among American troops that U.S. General Douglas MacArthur banned it to avoid upsetting Asians. However, its use towards Asians continued until the end of the Vietnam War.
Gook, the American racial epithet for all Asian Americans, is actually the Korean word for 'country.