Zillyhoo is the name of the war hammer that John Egbert obtains at one point in the popular web-comic Homestuck. It's sheer beauty and awesomeness astonishes the Wayward Vagabond, Courtyard Droll, and Karkat Vantas. The awesomeness of the war hammer compels John to to sing a majestic chorus to an imaginary cathedral window. It also appears in Andrew Hussie's other web comic called Problem Sleuth.