(military slang, now, historical) Finished, dead, no more, gone; non-existent.
1918 April, 'R', An elegy on my dugout, when it was done in, published in Four Whistles by D Company of the Scottish Officer Cadet Battalion, quoted in Graham Seal, ''The Soldiers' Press: Trench Journals in the First World War'' 2013 :
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(military slang, now, historical) Dead.
: What shall I do? / My poor old dug-out is napoo.
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(UK, army, slang) To finish; to put an end to; to kill.
He will napoo the rations.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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