From Wiktionary, the free dictionary
From Korean ㅂ니다 (-mnida, polite declarative suffix). Compare Chinese 思密達/思密达 (sīmìdá).
ニダ • (nida)
- (ethnic slur) Stereotypical sentence-final particle used in place of です (desu) to mock people of Korean descent.
- 独島は韓国の物ニダ。
- Dokuto wa Kankoku no mono nida.
- Dokdo is Korea's-nida.