Definitions by 5 Nights at Pinkie's

Flutterbat 

The name of the My Little Pony character Fluttershy when she became vampire fruit bat pony in season 4 episode 7.

Pinkie: OH MY GOSH FLUTTERSHY TURNED INTO A VAMPIRE PONY!!
Rarity: That's not Fluttershy... that's FlutterBAT!

Flutterbat by 5 Nights at Pinkie's May 26, 2015