The phrase comes from Thai, where it literally announces that Japan or Japanese people are arriving, with the final syllable drawn out for excitement. Online, that drawn out delivery turned it into a reusable entrance cue on soundboards and in short video edits. Creators pair it with other Japanese pop culture sounds such as nico nico nii and running in the 90s when building anime themed memes. Its popularity comes from how recognisable the build up is, even for viewers who do not speak Thai but understand the dramatic reveal.