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'.”
(..) -Oh, come on. You've got to kiss and go down on them. -What! Are you kidding me? -And death is not an option. l don't know. Rosie. -You're a pig. That's disgusting. -What are you talking about? -Rosie's all right. -Heads up. Here they are. -Hold on. Who would you do? -No time. We're on the job. (..)2004 White Chicks
(..) l'm Back Fat Betty.'' Now who could have said that? Yeah, it's Tina the Talking Tummy. l can't even wear a short skirt... and a top without looking like a fat pig. Calm down. l'll go see if there's something else out there for you. Okay? Do you think Heath will love.... Do you need help? (..)2004 White Chicks