noun. A tallywhacker-head of bullish, Shakespearian proportions.
Real citation: “Wouldst thou liketh that I speaketh in a tongue more apt to yon puzzled ears? perchance the manyfold twisting of yon pizzlehead to and fro, to catch but one tiny glimpse of thy lauded snoopyland and if only for an instant.”
(Sept. 8, 2005, http://www.ssnp.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=002410)
Made-up citation: "If thy dog is a pizzlehead, thou shouldst buy some pizzles. Because bull penises were meant to be doggie treats, according to the Bible."