Fluffy Ponies (Equus ferus caballus hasbioidae) are small creatures with fluffy bodies, childish speech, and low cognitive intelligence. Generally depicted as simple creatures literally designed to love and play, they are a subset of the My Little Pony: Friendship is Magic fandom.

Though there is some debate concerning the origins of the Fluffy Pony subculture, it is generally attributed to the creation of Fluffle Puff by Mixermike622 on January 2nd, 2012. This simple taco-loving, extremely fluffy pony is, in fact, a red herring: she is an Original Character created by Mixermike622 (then known as "Fluffy") after gaining popularity for drawing sketches of fluffy pony.

The "modern", dark Fluffculture is sometimes associated with the story "Magical Ponies" by an author called gorodetsky, published on December 9th, 2011 (somehow predating the more well-known Fluffle Puff for only a month). The story is rather a dark take on the "Human Raising Pony" concept, which somehow paved the way for basic "modern" fluffy pony headcanon; lisping and babyish speech. This too is a red herring as most Fluffy Pony in the earlier stories are portrayed as talking normally or have their dialogue presented in third person. It wasn't until an anon post a story about fluffy pony about Fluffy Pony wishing to kill itself (wan die) before correcting it into playing (pway) that the fluffspeak become a regular occurrence in Fluffy Pony stories.

https://the-fluffybooru-fluffydex.fandom.com/wiki/Fluffy_Ponies

https://tvtropes.org/pmwiki/pmwiki.php/WebOriginal/FluffyPony

https://knowyourmeme.com/memes/fluffy-ponies