After a night of heavy drinking in Chicago, a passed-out girl is carried upstairs and subjected to unspeakable acts performed on her anus. The next morning she wakes up and can't remember anything, or has possibly suppressed all memories of the event. But the lingering pain and difficulty walking serve as reminders of the carking she received the previous night.
Honey, make sure you wash back there extra well and drink up. There's gonna be a whole lotta Chicago Carking going on tonight.