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'.”
(..) The search will have to wait a little This decision was not difficult.. Well, let's go Waits. You're coming with me... Comes... On your knees, you pig but we wanted to help you, but just! yes Hold your tongue, yes Otherwise I cut it out to you? Fessle him. Are you a servant of (..)2011 The Dragon Warrior