Oppai ga Ippai (おっぱいがいっぱい), literally ‘full of breast’ in Japanese, is a popular children song in Japan (at least in the 80s), singing praise to mama’s breast (milk).
One of the wackiest music videos I’ve ever seen; call me an idiot, but I laughed from the beginning till the end… couldn’t resist, it’s just too funny, cute and weird.
Japanese lyrics and English translation available on Yojinbo.