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

splork!


    [Usenet; common] The sound of coffee (or other beverage) hitting the
    monitor and/or keyboard after being forced out of the mouth via the nose
    (also ?splorf?). It usually follows an unexpectedly funny thing in a Usenet
    post. Compare snarf, C|N>K.