A term coined by Michael Palin during the writing
of Monty Python’s Flying Circus. It refers to a moment of commentary or dialogue
spoken by an actor referring to the situation that character is in. For example
in Monty Python’s Quest for the Holy Grail, following Sir Gallahad’s discovery
of the Castle Anthrax – Dingo is telling the sad tale of her life… she turns
to the camera:

Oh, wicked, bad, naughty, evil Zoot! She is a bad
person and must paythe penalty… Do you
think this scene should have been cut? We were
soworried when the boys were writing it, but
now, we’re glad. It’s betterthan some of
the previous scenes, I think…

I just wrote my first article on
Wikipedia, go me! (Link)