The phrase "Lord Muck" is a colloquial expression that is used to describe someone who thinks they are of high social status or importance. There are various synonyms for this term, including "big shot," "high roller," "upper crust," "aristocrat," "snob," "elite," "privileged," "haughty," and "pretentious." These words all suggest a sense of superiority or arrogance, which is often associated with those who believe they are better than others. In summary, "Lord Muck" is a derogatory term that is often used to mock those who display a sense of entitlement or conceit.