Definition of mudders:
(n) :
(Internet) A participant in a multi-user dungeon.
(n) :
A racehorse that performs well on muddy or wet tracks.
(n) :
Alternative letter-case form of mudder (“person who participates in MUD games”). [A racehorse that performs well on muddy or wet tracks.]
(n) :
Pronunciation spelling of mother. [A female parent, especially of a human; a female who parents a child (which she has given birth to, adopted, or fostered).]