The acronym/slang for the DragonForce song entitled "Through the Fire and Flames".
Popularity of this song increased dramatically after it was included into Guitar Hero 3, as it was arguably the most difficult song to beat in the game.
The ability to beat this song on the Expert difficulty quickly became a very well known and sought after skill.
Many people began to listen to DragonForce and Through the Fire and Flames, making it the "cool" thing to do.
This prompted Facebook groups such as "I listened to dragonforce before GH3" to be created.
"What are you listening too?"
"Through the fire and the flames man!"
"It's.. there's no .. Why do you think there's only one t in TTFAF? .. cause.. never mind" Sigh*