It means Third wheel with paras Mahira. Which she was at that time
It's also a slang which means mistress
That is why i said that CONTEXT is very important which people are conveniently ignoring while blaming Asim for using the word FD !
Like Shukla might have used stepney in the sense that Sana was third wheel during the convo though the same word can also be used as a slang ..The context is important here right ?
Same way the context in which Asim used the word FD was not derogatory and he meant it from the game point of view
I hope my point is clear now 
😆

