The Free On-line Dictionary of Computing (19 January 2023):

C|N>K

    Coffee piped (pipe) through nose onto keyboard.  A chat
response indicating
   that the author laughed so hard that they sprayed coffee out of their
nose.
   Tea drinkers, on the other hand, would never behave with such lack of
decorum.

   (2022-08-15)


The Jargon File (version 4.4.7, 29 Dec 2003):

C|N>K
 n.

    [Usenet] Coffee through Nose to Keyboard; that is, “I laughed so hard I 
    snarfed my coffee onto my keyboard.”. Common on alt.fan.pratchett and 
    scary devil monastery; recognized elsewhere. The Acronymphomania FAQ on
    alt.fan.pratchett recognizes variants such as T|N>K = ‘Tea through Nose to
    Keyboard’ and C|N>S = ‘Coffee through Nose to Screen’. (The sound of this
    happening is, canonically, splork!)

    D