Bang around is an idiomatic expression that can have different meanings depending on the context. It can refer to moving around noisily, hitting objects accidentally or exploring a new place without a specific plan. However, there are different synonyms that can be used for each meaning. For instance, for moving around noisily, one could use stomp, trample or clump. For hitting objects accidentally, collide, bump into or jostle are some options. Finally, to explore a new place without a specific plan, wander, roam or meander could be used. Overall, depending on the context, there are several synonyms that can replace the expression "bang around".