The full form of FNAF is Five Nights At Freddy’s
This acronym is used most often to represent the title of the game “Five Nights At Freddy’s.” It is a single player game in the horror genre of video games where a player must survive five increasing difficult levels without being killed by one of the animatronic characters that come to life after the pizza shop they are in closes.

Origin of FNAF

The idea behind Five Nights at Freddy’s came from another game produced by creator Scott Cawthon. The previous game creation was family-friendly and featured a beaver. However, players of the game said the beaver looked like an animatronic character and was scary. Cawthon, who usually produced family-friendly and Christian oriented games, changed speeds and produced Five Nights at Freddy’s based on user criticism, The game was officially released to the public through the gaming company Desura on August 20th, 2014. Since its initial release, the game became popular with online gamers and has since produced four sequels.

Other Meanings
Other than two French national organization, there are currently no other known meanings of the acronym or the phrase that it officially represents.

Conversation Examples
A discussion between two friends via text message.

Friend 1: Have you ever played FNAF?
Friend 2: I can’t! I tried, but I can’t handle the jump scares. They scare the crap out of me!
Friend 1: I tried for the first time tonight and I think I almost had a heart attack several times.