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Adjective. Fantastic times a million. Absolutely amazingly fantastic. Something can be considered Fantabulastical when it simply can not get any better
"How are you doing today?"
"I'm Fantabulastical!"

Or

*makes funny joke*
*chuckles to self*
"I'm Fantabulastical"

Or

"How was dinner?"
"Fantabulastical!!!"
by Huntress4514 June 18, 2016
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