An exclamation used equally in times of excitement and frustration, designed to cause a similar feeling in the one to whom it has been said, yet utterly failing to do so. Originally used in Jane Austen's 'Pride and Prejudice'
1) Anger: ie, upon finding out your husband has just told your daughter he will never speak to her again should she marry someone you feel is a suitable match: "Oh, Mr BENNET!"
2) Delight: ie, upon finding your daughter is going to marry one of the most eligible men in the country, although he may own the miserable half of Derbyshire: "Oh, Mr BENNET!"
Named for the British TV show of the same name, it is the act of waking up hungover in a strange place with no recollection of how you got there (and optionally in different clothing than you left in)
This originates from the plot outline of each episode of Mr Benn being that the titular character would enter a magical clothes shop, get changed in a changing room, then exit to a new different place