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The origin the term is a corruption by British soldiers of "Yā Ḥasan! Yā Ḥosain!" which is repeatedly cried by Shia Muslims as they beat their chests throughout the procession of the Muharram; this was then converted to Hosseen Gosseen, Hossy Gossy, Hossein Jossen, and ultimately Hobson-Jobson.
The Hobson-Jobson is now used to refer to a word or phrase borrowed by one language from another and modified in pronunciation to fit the set of sounds the borrowing language typically uses; it is also the name of a popular dictionary of anglo-indian words.
Dominic: Hobson-Jobson man..guide to anglo-indian slang but definitely not as riveting as Samosapedia!