The clip circulates on Japanese soundboards with the phrase sushi no nioi ga suru, meaning it smells like sushi, and is tagged to Undertale because of Undyne, the fish like spear wielding character from Toby Fox's 2015 role playing game. The uploader credit is Soujiro and the file title adds a wish to eat sushi with Undyne, framing it as a fan joke rather than an official game line. Its short length and specific food reference made it easy to repost as a reaction button, where the humor comes from applying a very literal smell comment to unrelated scenes.
O tym dźwięku
A short Japanese voice clip saying it smells like sushi, linked to Undyne from Undertale. Used as a random food and anime game reaction sound.
This is a very short Japanese spoken line that translates to it smells like sushi, delivered in a flat, matter of fact tone that lasts just over a second. There is no music or background noise, just the clear voice landing the oddly specific observation and then stopping. That abruptness is what makes it funny, because it sounds like a serious detection rather than a joke. Dropped into a video it instantly turns any fish, food stall or sea scene into a deadpan punchline, and viewers who know Undertale connect it to Undyne and her fishy character design.