1. the person is in trouble, possibly doomed, and worthless; people do not like or trust someone

1. Everyone knows that it was Tiger who started the fight during the game. Now that we’re disqualified, his name is mud.

2. The scandal ruined his reputation and now his name is mud.

3. If he doesn't turn up tonight, his name will be mud.

4. If I can’t get this contract signed, my name will be mud.

5. His name is mud ever since he broke the crystal vase.