Humungous Bighead... 'It's because of you, Perce,' said George seriously. 'And there'll be little flags on the bonnets, with HB on them - ' ' - for Humungous Bighead' said Fred. - Harry Potter and the Prisoner of Azkaban. Chapter 4, the Leaky Cauldron. I have 2 questions: 1) What is HB? As I understand it is not Humungous Bighead. 2) What is Humungous Bighead. As I understand it game of words: humungous is something + enormous and bighead is big + head + probably, there is some more point here. So, it is a joke of two hilarious twins Fred and George, isn't it, but I can't understand it :( Thanks for your help!