Top Definition
This is a combination of fantastic and autistic. This is a person that is autistic and has a talent that people think is fantastic. Kinda like rain man who could do mathmatical equations instantly.
It is fantastistic how he can stack those playing cards 6 feet high without having them collapse!

It can be fantastistic to be autistic when you have a fascinating ability to do something far better than almost anyone else.
by sweetmagnoliya January 03, 2012

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