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Slang combination of "phenomenal" and "fabulous".

1. almost impossible to believe; incredible.
2. Informal . exceptionally good or unusual; marvelous; amazing; superb: a phenabulous drink; a phenabulous new car.
3. told about in fables: the fabulous exploits of Elvis.
4. known about only through myths or legends.

Origin: 2010, Las Vegas. Slip from person trying to say phenomenal.

—Related forms
phenabulously, adverb
phenabulousness, noun
unphenabulous, adjective
unphenabulously, adverb
"I just got promoted to the Tokyo division with 300 paid days off."

"Seriously? That's phenabulous!"
by Meatghost January 13, 2011