Technically, gook had multiple origins. One was Korean. Taken from migok. Korean word for America. Pronounced me-gook.
Also from Philippine Conflict where American troops referred to the natives and prostitutes as gooks.
Marines used it in Nicaragua, too, during Smedley Butler’s banana wars.
Became generic term… but origins are most likely Korea and Philippines.
Follow me for more un-woke racial slur etymology. Soldiers of all Armies are the best at it!! Someone could do a PhD. dissertation on the origins of names soldiers called “natives” and enemies.
Been happening since Greek times!
Sirhr