An attempt to retract a social faux pas, often a rant, implying -- usually jokingly -- that the whole thing was just an act. Originates from auditioning on the stage, when an actor would add it at the end of a scene and mean it literally.
Person 1: "I hate those Sunday drivers"
Person 2: "Me too! This one guy was going like 30 MILES AN HOUR TOO SLOW and I was leaning on my horn but he was eating a donut and was all like WHY DON'T YOU WAKE UP YOU INCONSIDERATE F*CK AND GET THE F*CK OUTTA MY WAY!"
*Crickets and wide-eyed stares*
Person 2: "And... scene."