A japanese word for "dumpling". This is where the phrase "odango atama" (dumpling head) comes from; and is used to describe anyone with a hairstyle where two balls of hair are sat on the head.
In the Western world, where odango (Japanese dumplings) are uncommon, the phrase is turned into 'meatball head' to keep the round foodreference.
Im translation, "meatball head," or "dumpling head." Referring to Serena/Usagi Tsukino on the anime series Sailor Moon. Darien/Mamoru calls her this because of her "meatball-like" hairstyle.