As others have already alluded to, the term has its origins in a certain childrens' book.
According to this article (dated Dec 1, 1999), here's where the term comes from:
"Named after the beasts in Winnie the Pooh who nibble the fur of unsuspecting teddies while they sleep, cyberwoozles are parasite programs which infiltrate a computer from the Internet, read the user's e-mails, steal his passwords, and even use his PC's microphone to eavesdrop on conversations."
Of course, Winnie the Pooh is better known in the network security industry for his extensive research into honeypots.
BTW, the author, the BBC's Max Foster, isn't a tech hack, but rather a bamboozled financial hack. He must have been under some kind of deadline. Not even one attributed source.