The phrase "bang about" means to move around in a rough and careless manner. There are several synonyms that can be used to convey a similar meaning. Some possible alternatives include "thump around," which emphasizes a heavy, pounding sound; "crash about," which suggests a chaotic and disorderly movement; and "bump around," which implies a jerky and jarring motion. Other possibilities include "jolt about," "jiggle around," and "shake about." All of these verbs can be used to describe a person or object moving abruptly and without much control, and can add lively and descriptive language to any written work.