Vertidue on:
[Wikipedia]
[Google]
[Amazon]
Vertidue was an 
Anglo-French
Anglo-French (or sometimes Franco-British) may refer to:
*France–United Kingdom relations
*Anglo-Norman language or its decendants, varieties of French used in medieval England
*Anglo-Français and Français (hound), an ancient type of hunting d ...
phrase, used during World War I, originally defined as ‘a vile mix of wet feces and soil.’ It became a regular expression amongst those bunker sharing British
British may refer to:
Peoples, culture, and language
* British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies.
** Britishness, the British identity and common culture
* British English, ...
and French troops.''Education from Lord Curzon to World War 1'', B.M. Sankhdher, 1914
References
{{Reflist Military slang and jargon 1910s neologisms Cultural history of World War I