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Flutterbat is an image of "Fluttershy" from the animated cartoon My Little Pony: Friendship is Magic as a fruit bat, which is widly popular amongst the brony community. It is usually recoloured as another pony from the show.
Flutterbat had made her debut in the episode "Bats!" in season 4, which was released in December of 2013. After fruit bats had infested Sweet Apple Acres, AppleJack asked for help from her friends Twilight Sparkle and FlutterShy, but Twilight's spell had backfired and caused FlutterShy to become a fruit bat herself, craving nothing but apples.
There are over 2834 images tagged under "Flutterbat" on Derpibooru, 2000+ images on Deviantart, and the are numerous Tumblrs about Flutterbat. She is also associated with the meme Brushie Brushie Brushie, as her bat like features fits into contexts (shown below)