The phrase "shook leg" is an informal term used to describe a person who is moving quickly or dancing energetically. However, there are several synonyms for this phrase that can also be used to convey the same meaning. Some of these include "groove," "bust a move," "boogie," "shake a leg," "cut a rug," and "get down." These terms can be used interchangeably to describe someone who is dancing or moving with energy and enthusiasm. Whether you're hitting the dance floor or just trying to get some exercise, these synonyms can help you express yourself in a fun and lively way.