It's what the Japanesse reffers to people that are sexual attracted to young boys (similiar to lolicon ), also they are known as Big Titty Onee-san.
Usually shotacons are identified as young women of age 17-30, with big boobs and when they hunt their prey, they try to lore it by smiling at it and adding Ara Ara in front of their sentence.
"Ara ara, are you lost little boy? Don't worry, Onee-san will help you." - Some random girl from a manga I read at nhentai under the tag of Shotacon and Big Sister.
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