Gook

The etymology of this term is among the most disputed of any English-language slur, with multiple competing theories and no scholarly consensus. One prominent theory traces it to the Korean word 국 (guk), meaning country or nation, which appears in the Korean name for Korea itself, 한국 (Hanguk); American military personnel during the Korean War may have adopted the term from hearing Koreans refer to their own country. A second theory locates the origin earlier, during the Philippine-American War (1899–1902), where American soldiers may have derived it from a Tagalog or other Filipino term. A third theory connects it to goo-goo, a derogatory term for Filipinos attested from the same period, with gook representing a later modification. Some scholars have also suggested a connection to the Nicaraguan usage during the United States occupation (1912–1933), where local people were reportedly referred to by this term. The military vector of transmission is common to most theories.

The term is distinguished by its intimate connection with the history of American military intervention in Asia and the Pacific. Its earliest documented usage dates to the Philippine-American War at the turn of the 20th century, where it was applied to Filipino combatants and civilians by American soldiers. The term resurfaced during the Korean War of the 1950s, where it became the predominant derogatory term used by American military personnel for Korean people, both North and South. During the Vietnam War, it was transferred with minimal modification to Vietnamese people and became one of the defining terms of that conflict's dehumanizing rhetoric, appearing extensively in soldiers' accounts, journalism, and subsequent literary and cinematic representations of the war. The term's serial application to different Asian populations across successive conflicts has been cited by scholars as evidence of its function as a generalized racial dehumanization device rather than a nationality-specific epithet. Senator John McCain's public use of the term in 2000, referring to his Vietnamese captors, generated significant controversy and renewed public discussion of the word's status. In contemporary usage, the term is recognized as one of the most severe anti-Asian slurs in American English, carrying connotations of both racial contempt and the specific violence of wartime dehumanization.

The term has maintained extreme taboo status since at least the Vietnam War era, when its association with wartime atrocity and dehumanization became a subject of public discourse. Unlike some military slang terms that fade from use after the conflicts that generated them, this term has persisted in the civilian lexicon as a general anti-Asian slur, though its military associations remain strong. It is excluded from broadcast media, journalism, and public discourse except in direct quotation or historical analysis. No reclamation effort has been documented. The word's appearance in public speech is uniformly treated as a hate speech incident, and its use has been cited as an aggravating factor in hate crime prosecutions.

The term is overwhelmingly associated with American English and specifically with American military culture. It has limited attestation in other varieties of English, as its transmission vector was the American military presence in Asia and the Pacific rather than broader Anglophone contact with Asian populations. In British, Australian, and Canadian English, the term is recognized primarily through American cultural exports, particularly Vietnam War literature and cinema. Within the United States, the term is documented across all regions but is particularly associated with military communities and veterans' speech. Its usage spiked measurably during each major American military engagement in Asia and subsided, without disappearing, between conflicts.