Green’s Dictionary of Slang

W2 n.

[the signature affixed to his telegram sent to Paul Kruger (1825–1904), president of the South African Republic and leader of the Boers, on New Year’s day 1896]

the German Kaiser Wilhelm II (r.1888–1918); thus ext. to any military-looking man.

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[UK] (ref. to 1896) in J. Ware Passing Eng. of the Victorian Era.