Can be a mysterious, funky substance, like some asian chick's tuna center. Usually referring to when something hits just right OR feels "laced."
Stephen cannot rest in the middle of the night. He feels noxious and maybe he will even vomit. "I just had some sunny d, and some spaghetti. And das really it," said Stephen when commenting on what he ate for dinner. Must've been that gagooshy d (gagoosh-laced sunny d, as in it was probably wrong somehow) that did it.
1. the devastating act of killing an opponent with the gravity hammer in video game Halo 3
2. wherein by one entity displays an act of superiority upon another
1. I'm going to gadoosh your ass.
2. Dude, you were totally gadooshed by that guy.
3. I just gadooshed that test