Meaning

noun a slang term for Great Britain used by British troops serving abroad

originCorruption of the Hindustani विलायती (vilāytī) / وِلایَتی (vilāyatī, “foreign”), which is related to Arabic ولاية (wilāyah, “state, province”), whence also, through Turkish, vilayet. Sir Henry Yule and Arthur C. Burnell explained in their Anglo-Indian dictionary, Hobson-Jobson, published in 1886, that the word was used in the names of several kinds of exotic foreign things, especially those that…

Etymology from Wiktionary, CC BY-SA 3.0