ATF 

1. A part of the government dealing with th control of Alcohol Tobacco and Firearms.

2. An online gaming family, slowly making its way into every online game for the past 11 years.

*S* homos! Whos up for some humping?!

ATF by Klae February 3, 2005

ATF 

According To Facebook

Did you hear about Tom and Lilly? ATF, they're in a relationship.

ATF by PabloHalverson November 29, 2010

ATF 

Alcohol
Tobacco and
Firearms

agency

OR

Automatic
Transmission
Fluid

ATF by Cletus March 23, 2003

ATF 

As pertaining to Dr. Sheldon Cooper's (primary character of The Big Bang Theory) tendency to think of himself as the comic book hero, The flash. This acronym is quite understandably extended out to be "As The Flash"
Meaning both that you are pretending to be and are considered to be The Flash.

Dr. Sheldon Cooper ATF (As The Flash)

ATF by DRSHELDONCOOPERastheflash May 21, 2011

ATF 

All Things Fre$h.

Extreme Drake fans are members of "ATF."

ATF by DrizzyxDan305 November 16, 2011

ATF 

Ain't that fused.

Meaning I cannot be bothered or couldn't care less.

Do you think we should finish this job before leaving?

I'm ATF. Let's goto the pub!

ATF by typeRtony February 6, 2014

ATF 

Attempt to fuck

When a fuck has gone wrong due to several different possibilities (i.e. whiskey dick, no condom etc.)

"You're usually DTF but it turns into a ATF."

"Yeah, she was DTF but we didn't have a condom and she didn't want to pull out so it turned into an ATF"

ATF by DTF24/7 October 23, 2011