person who insists everything is better abroad; self-hating Japanese (internet slang)
Derogatory internet slang, especially in football contexts, for a Japanese person who constantly praises foreign countries and criticizes Japan. The 厨 suffix is a derogatory label for an obsessive person.
See also: 厨房
That forum has a lot of self-hating Japanese who post that everything is better abroad.
When the topic turns to football, the 'overseas fanatics' quickly appear and disparage the J.League.
Compound of 海外 (overseas) and 厨, a derogatory internet slang suffix derived from 厨房 (kitchen) used to label obsessive or fanatical people. The exact origin of 厨 as a derogatory suffix is uncertain, but it is widely used in online communities.