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.
To increase the liveliness of a horse by inserting an irritant, such as a piece of peeled raw ginger or a live eel, in its anus.