After 30 years, the real meaning of 'C. H. U. D.' has been revealed.
Apparently, it stands for "Cameras Hidden Under Dresses":
http://www.gloucestertimes.com/local/x977551406/School-changing-room-v ideo-incident-sparks-probe
Yep, it's the same Abbott guy who wrote the first draft for CHUD. (Which doesn't have that much to do with the final picture, of course.)