Longman Dictionary of Contemporary English - mud

~ n 1 wet earth that has become soft and sticky  (His shoes were covered with mud.) 2 your name is mud spoken if your name is mud, people are annoyed with you because you have caused trouble  (His name is mud in the office after what happened.) 3 earth used for building  (a mud hut) 4 here's mud in your eye spoken old-fashioned used for expressing good wishes when having a drink with someone; cheers (1)  (- see also as clear as mud clear1 (19))