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 worthless or contemptible person; a gobshite or toerag.
The scrotum.
A stereotypical low-value and obnoxious man.