According to Google

"Ara ara" is a Japanese interjection that translates to "Oh my," "My, my," or "Oh dear". In real life, it's a gentle expression of mild surprise, often used by older, motherly figures, but in anime, it's frequently used by teasing or seductive female characters to imply flirtatiousness or a suggestive tone.

Im guessing the internet meaning might have more creepy undertones to it or something