a rolling stone
A person who wanders or travels often and at length, without settling down for any significant period of time. Based on the proverb "a rolling stone gathers no moss." I never knew my father very well. He became a bit of a rolling stone after my sister was born, so he'd only ever hang around for a week or two at a time.
a rolling stonea person who does not settle in one place for long.
This expression comes from the proverb a rolling stone gathers no moss , meaning that a person who is always moving on will not accumulate wealth or status, or responsibilities or commitments.