noun
Internet slang term borrowed from Korean 일보 (ilbon). Used in online communities, often with a derogatory or mocking tone toward Japan or Japanese people. Not used in polite or formal contexts.
from Korean ilbon
ネットで「イルボン」って書いてあるのを見たけど、どういう意味?
I saw 'イルボン' written online, what does it mean?
あの掲示板では、日本をイルボンと呼ぶ人が多い。
On that forum, many people call Japan 'イルボン'.