noun
soft ice cream sold in a balloon
A novelty soft-serve ice cream served inside a small balloon; the balloon is peeled away as you eat. The name is a playful compound of おっぱい (slang for breast) and アイス (ice cream), referring to the shape.
縁日でおっぱいアイスを買った。
I bought a balloon ice cream at the festival.
おっぱいアイスは、風船をむきながら食べるのが楽しい。
Balloon ice cream is fun to eat while peeling the balloon away.