If you’re footloose, you have no responsibilities or attachments and you're free to roam. You can go where you want and do as you please. You might even want to kick off your shoes and dance, like the teens in the 1984 movie Footloose.
Being footloose is being free of obligations — no job, pet, house, schoolwork, or sweetheart to hold you down. A footloose and fancy-free person might take a year off after high school just to wander. You'll often find footloose in the phrase "footloose and fancy-free." In the 17th century, footloose meant literally "with feet unshackled."