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a mix of the words 'jackass' and 'fantastic' but made by someone who thinks they're the smartest person in the room
My math test was jackasstastic. I got a 100% by accident and I still didn't know how to do any of it.
She said her idea was 'jackasstastic' and then tried to build a robot out of Legos and bubble wrap.
The new pizza place is jackasstastic. They put hot dogs on the crust and called it a 'gourmet twist.'