The Cru gets a wee bit saucy with this one.  Murph shines with lubricious limericks that showcase the raunchiest of WWII postal codewords.  Be warned: you'd best listen with headphones.

From Brewer's Dictionary of Phrase and Fable: 
NORWICH. An acronym based (phonetically) on the 
initial letters of ‘(k)nickers off ready when I come home’, 
one of the more lubricious of such initialisms for which 
there was a craze in the mid-20th century. They usually 
appeared on the envelopes of love letters (a less steamy 
example was SWALK, ’sealed with a loving kiss’), 
fashion for them probably got going among servicemen 
overseas in the Second World War.

More secret sexy codes your grandparents may have used:
https://en.wikipedia.org/wiki/World_War_II_postal_acronyms

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