One of the mysteries of the English language finally explained.
no object To celebrate uproariously, rejoice extravagantly, especially on an occasion of national celebration (originally the relief of the British garrison besieged in Mafeking (now Mafikeng), South Africa, in May 1900). In later use usually with pejorative connotations.
Early 20th century; earliest use found in The Pall Mall Gazette. Back-formation from the place name Mafeking, treated humorously as a present participle.
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