AF       
 informal offensive (also af)真他妈的(as fuck的缩写,用作强调,多用于社交媒体或手机短信等) 
written abbreviation for as fuck: used, for example on social media and in text messages, for emphasizing something
  He can be dumb AF sometimes. 他有时候真他妈的傻。 
 They're rich af. 他们真他妈的有钱。 
 - More examples
- This is stupid AF.
- The pains were bad AF last night.
- Here's how to make yourself feel better when you're as sad AF.