dirtbag

noun2

1. •
   (slang, offensive) A dirty, grimy, sleazy, or disreputable person.

   • I'm just a teenage dirtbag, baby. Listen to Iron Maiden, baby...with me. — 2000
2. •
   (slang) 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.