1 definition by AaronThePianoMan

(adjective): Fan-too-byuh-lr-ta-stuhk Something that is so amazing so you need to have more than one word to describe it. It is like an experience that is so fun and awesome that you have to describe it with a word that is as insane as the experience!
That outing on Friday was just fantubulartastic!
by AaronThePianoMan May 25, 2023
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