rolling stone

Short definition from Wiktionary

Noun

1. 1
   A person who moves around a lot and never settles down; a vagrant.
2. 2
   A womanizer.
3. 3
   A geological phenomenon where rocks move and inscribe long tracks along a smooth valley floor without animal or human intervention.
4. 4
   A meteoroid.
5. 5
   Any of the members of the Rolling Stones.