expression
Slang expression used humorously or derogatorily to mimic Korean speech, replacing だ in attributing an utterance to a Korean person. Often carries a mocking or jocular tone.
from Korean ni-da
See also: だ
「これがキムチニダ」と彼は冗談で言った。
"This is kimchi," he said jokingly, using the Korean-style ending.
ネットで「日本人は寿司を食べるニダ」と書いてあるのを見た。
I saw someone write online, "Japanese people eat sushi," with the mocking Korean-style ending.