I think I've figured out most abbreviations on MN but I just can't imagine what cf might stand for even though I understand how it's used. The only thing I can think of is "cunt fucker" but it's not that is it?? 
Also, what is ama?
It took me ages to figure out what is pita but it finally clicked. 
Does anyone else have any abbreviations they don't understand?
(Apologies if this information is available somewhere)