The phrase "bust out joint" might refer to a physical injury like dislocating a joint, but it's more often used to describe escaping from a place, like a prison or a boring lecture. There are plenty of synonyms for this phrase, including "break out," "make a run for it," "escape," "flee," "bolt," and "get away." Other related phrases include "bail out," "cut and run," "hightail it," "head for the hills," and "skedaddle." Regardless of the wording, the implication is clear: it's time to leave, and fast!