The voluntary insertion of a particular meat product; a sausage into one's backside. Usually performed for pleasure or sometimes to win a bet.
Born in Norfolk, 'bot a sausage' takes place regularly, the Mayor of Norfolk is in the process of making it a public holiday.
Norfolk 'young chap' - "What day does bot a sausage fall on this year Dad?"
Norfolk young chap's father (unconfirmed) - "Well son (unconfirmed), we can go upstairs now, I've just had delivery of bratwursts!"
Norfolk 'young chap' - (Clapping hands) "Yippee!"