Made up by two idiots a few years ago, this word is offered as a response to something amazing, or something so completely awesome that you will automatically, and undoubtably, jizz inside your trousers. Or pants.
1: dude, the new Grand Theft Auto 5 gameplay looks jiztastical
jimtastic n. minor celeb. particulary adept at emptying public houses with an eclectic mix of indie, punk and ska.
jimtastic v. to achieve a full days wages within at least four hours of playing the above said playlists.
jimtastic a. the description of a woefully bad dj.
i went to the the boozer the other day to see djjimtastic he only did a jimtastic ! he was the worst jimtastic dj i have ever heard.