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'.”
(..) girl I'd ever seen. When I was , I was all elbows and knees and Alanna looked like a goddess sent to torture me. Pig-face, she called me. Pig-face? That's ridiculous. I think it had something to do with my nose. Whenever she passed me (..)2013 TvShow: Game of Thrones Title: And Now His Watch Is Ended Season: 3 Episode 4