Since 4chan people seems to be misusing the meaning of the word "gook",
I would like to tell you the origin of the word
Origin of the word "gook"
When American soldiers stationed in Korea during the Korean War, they happend to ask the locals for their names,
They all answered, "me-gook, me-gook".
Gook means country in Korean, and me-gook means America in Korean.
In fact, the Koreans then simply looked at the American soldiers and said "America(me-gook), America(me-gook)".
The soldiers took the "me gook" to mean "I am a gook". Since then, they called the Koreans "gook".
That's where the word "gook" comes from.
Other theories, would be propaganda efforts by Koreans to cheat on the origin of the word gook,as usual
Since 4chan seems to be misusing the meaning of the word "gook", I would like to tell you the origin of the word