A dirty, grimy, sleazy, or disreputable person.
A poor climber, alpinist, skier or other outdoorsman who lives cheaply, without normal employment, and with few amenities in order to spend as much time on their sport as possible. Used praisingly.
A child who plays in the mud; a child that spends most of its time in the streets, a street urchin.
A soldier of the Royal Engineers.
Any of various birds that are found in muddy places or build their nests with mud, especially Anthus petrosus and Alauda arvensis.
The Grallina cyanoleuca that builds its nest with mud into a bowl-like shape.
A racehorse that performs well on muddy or wet tracks.
To scavenge in river or harbor mud for items of value.