This retardness began on PS3/Xbox 360 games, but it has already started to ruin PC gaming.
Achievements allow players from around the world to compare length of their penises without need of meeting cock to cock.
1. Some retard from Taiwan got all achievements in World of Warcraft. What an ACF!
2. "Hey, let's kill this boss while having our left hand middle finger inside our asshole so we get the achievement". What an ACF!
Used to describe the often-annoying Auto-Correct feature on many smartphones. Unless prevented otherwise, the Auto-Correct feature may choose to transform the word completely, thus rendering the phrase nonsensical. In such situations, the victim often can't be bothered to re-type the corrected sentence and an added apology. This can be rectified, excuse-free, by typing "ACF" followed by your originally intended phrase.
A: "ACF Yaay I finally got the book."
B: "Oh really?"
A: "ACF Yaa!"