Chut is slang for the slang word "
choad", in which a man's penis is wider than it is
long. It is always used in a derogatory form and often used to sum up a guy simply by how he looks and not actually after inspecting his penis. It is often used as a root word for undignified nicknames (e.g. "Chutty McChutterson", "
Prince Chuttingham", etc.)