fillyfooler 

A mare who is attracted to other mares.

Rainbow Dash is very likely a fillyfooler.

fillyfooler by A_Random_Brony May 7, 2011

FillyFooler 

A homosexual pony (commonly female), the word FillyFooler is mostly used in My Little Pony: Friendship is Magic fanfictions.

Friend1: Did you know that Rainbow Dash is a FillyFooler?
Friend2: Really? No way!

FillyFooler by Bittersweetstarboy_ July 10, 2019

FillyFooler 

A homosexual (usually female) pony.

Friend1: hey! Did you know that Rainbow Dash is a FillyFooler?
Friend2: really? No way!

FillyFooler by Bittersweetstarboy_ July 10, 2019

Filly Fooler 

Commonly used in My Little Pony: Friendship is Magic fanfictions. A Filly Fooler is a pony that is attracted to the same gender.

In FlutterDash shippings Rainbow Dash and Fluttershy are depicted as Filly Foolers

Filly Fooler by EpicDash377 March 2, 2015