Spend time idly, loiter, as in Every afternoon they could be found hanging around the mall. [Mid-1800s] Also see hang out, def. 4.
Keep company or consort with someone, as in The younger campers loved to hang around the older ones. [Mid-1800s] Also see hang out, def. 5.
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.