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'.”
(..) such as tissue, bones, organs... But you're not waiting. I was told the body was dumped on a pig farm in Virginia. Yeah. So the noise of the pigs feeding woke up the farmer, so he was able to stop them before they finished eating (..)2014 TvShow: Bones Title: The Master in the Slop Season: 9 Episode 14
(..) I'll call if it concerns you. I got waffles flying all over the place here. That's hot. That's hot. The remains are in the pig troughs? Yes. I am setting up a filtration system that will allow us to separate liquid in the pig slop from any human remains, (..)2014 TvShow: Bones Title: The Master in the Slop Season: 9 Episode 14