What does ATF stand for?

Depends

If you work for the Treasury Department, it's Alcohol, Tobacco and Firearms. For our purposes here it's

All
Time
Favorite

thirsty

Reepends

Well the ATF used to be the BATF...which I called the Bureau of A$$holes Twits and Fools.  (I hope that doesn't get censored

But I like All Time Favourite nowadays.. LOL

TET