Hepped up is a slang phrase used to describe someone who is hyperactive, excited, or enthusiastic about something. There are several synonyms for this phrase, including jazzed up, amped up, psyched up, pumped up, fired up, and revved up. All of these words carry a similar connotation of heightened energy and enthusiasm. They can be used interchangeably in various contexts, such as expressing excitement about a new project, getting motivated for a workout, or hyping up a crowd. Whatever the situation, using any of these synonyms for hepped up is a great way to convey a sense of enthusiasm and excitement.