"There are many theories about the origin of this word, and since it arose in oral use, we may never know the answer for sure," Martin said. "We think the most likely theory is that it is an alteration of work, because that word has a history of being used in similar ways, with dancers being encouraged to 'work it.' The 't' could be a result of blending with another word such as twist or twitch."

"Twerk" will be added to the dictionary as part of its quarterly update, which includes words such as "selfie," the word typically used to describe pouty smartphone self-portraits, "digital detox" for time spent away from Facebook and Twitter, and "Bitcoin," for the nationless electronic currency whose gyrations have also caught the world's eye.

Oxford Dictionaries is responsible for a range of reference works, including Oxford Dictionaries Online, which focuses on modern usage, and the historically-focused Oxford English Dictionary, which probably won't be adding "twerk" to its venerable pages any time soon.

The definition: "Twerk, v.: dance to popular music in a sexually provocative manner involving thrusting hip movements and a low, squatting stance."

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