Earlier quoted context omitted.
Looks up "af"
The other problem is people not capitalizing abbreviations as they should. You see even major news organizations doing it. The entire nation of Great Britain appears to think there's a space agency called "Nasa." Ignorant AF.
Capitalization or lack thereof can indicates tone - e.g yelling etc.
For example - What’s up mf! (greetings) vs. What’s up MF! (fight/challenge)