Found 2 items, similar to mudder.
English → English (WordNet) Definition: mudder mudder n : a racehorse that runs well on a muddy racetrack
English → English (gcide) Definition: Mudder Mudder \Mud"der\, n. 1. a racehorse that exhibits a better than usual performance when the racetrack is wet or muddy. [PJC] 2. An athlete who performs better than his/her average under muddy conditions. [PJC]