slang Having very large and well-defined muscles. (Hyphenated if used before a noun.) Tom used to be a skinny little dude, but he spent the summer getting jacked out. With my simple workout routine, you won't need expensive supplements or endless time at the gym to be totally jacked out! The film is filled with jacked-out dudes and buxom ladies.
mod. angry; annoyed. Boy was that old guy jacked out at you.