Allthough it usually means "The fuck" ( shortened version of WTF ), It can be used as an abbreviation for the game
Team Fortress 2, or used as an abbreviation for the
fetish Transformation
Ex 1:
Guy: "I dropped my bag of condoms that
I carry with me 24/7"
Other guy: "TF
perma-virgin"
Ex 2:
Another Guy: "Wana play TF with me?"
Yet another fucking guy: "Yeah, sure"
Ex 3:
Kinky mf: "I have a TF fetish"
Anti
kinker: "TARGET ACQUIRED"