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.)