The “A I U E O” section is a direct reference to vocal warm-ups or kindergarten exercises . It reinforces the song’s childlike, non-threatening, almost educational tone – as if Miku is teaching you to pronounce vowels while juicing.
While the song sounds like a commercial for a grocery store, fans have interpreted it as a parody of 1980s Japanese health-crazed commercials. The repetition of "Mada mada" (still more) suggests an overwhelming, almost aggressive list of healthy ingredients. However, the sudden halt ("Let's stop here for today") implies even Miku gets tired of vegetables. It is a quirky mix of health advocacy and exhaustion. popipo miku lyrics
In late 2000s Japan, vegetable juice (like Kagome’s) was marketed as a health drink for busy people. PoPiPo parodies this by being hyper-energetic about an otherwise mundane act. The absurdity is the joke. The “A I U E O” section is
ポポピポ ポポピパ ポポピポ ピピピパ (Popopipo Popopipa Popopipo Pipipipa) ポポピポ ポポピパ ポポピポ ピピピパ (Popopipo Popopipa Popopipo Pipipipa) The repetition of "Mada mada" (still more) suggests