He is a sexist 'pig'. = He is a 'male chauvinist pig'. [=he is a man who thinks women are not equal to men]
The train station will be renovated 'when pigs fly'. [=it will never be renovated]
“This time I think he'll ask me to marry him!” “Yeah, and 'pigs might fly'.”
(..) Gone? They're gone? Idget... What did you do? You ate them! You greedy, greedy pig. No! I... She ruined trollstice! Guards, lock her up! Let's get her! Lady glittersparkles? (..)2016 Trolls