ウンウンエンニウムじゃなかったです
un'un'enniumujanakattadesu

Noun
Desu Copula

The polite, past negative form of ウンウンエンニウム

1. Didn't say "um-um-en-nium"; Didn't affirm with "um-um-en-nium"

Past/Perfective
Negative
Polite
Casual Register