someone's name is mud
(one's) name is mud
Said of one who is regarded unfavorably, often because their reputation has been tarnished. Despite predating Abraham Lincoln's assassination, the phrase is often said to refer to Dr. Samuel Mudd, who was jailed for treating John Wilkes Booth after Booth shot Lincoln. Now that staff knows that I'm the one who proposed the layoffs, my name is mud. His name is mud now that he's been found guilty of embezzling money from the company.
someone's name is mudINFORMAL
If you say that someone's name is mud, you mean that they have said or done something which has made them very unpopular with a particular group of people. His name has been mud at the Telegraph since he left to work for a rival newspaper. Note: This expression may refer to Dr Samuel Mudd. John Wilkes Booth, the assassin of Abraham Lincoln, broke his leg while trying to escape and was treated by Dr Mudd. Although Mudd did not know what his patient had done when he was treating him, he was put in prison and he and his family were hated for many years.
someone's name is mudsomeone is in disgrace or unpopular. informal
Mud was a colloquial term for a fool from the early 18th century to the late 19th century.
1998 Times Just because I smoked a few lousy cigarettes every hour for 25 years, my name is mud in the insurance business.