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Fannytastic can be used to describe an action or person, in a situation where plain old "fantastic" doesn't have the magnitude to convey the importance.
Being Fannytastic can imply a lack of restriction within imagination, suggesting that someone who is Fannytastic has magnificent ideas that could take you to the moon!

Correct usage in a sentence: "Did you hear she’s picking up her life in France to move to Australia?"
Response: "Damn, that’s Fannytastic!."
by CizzaW February 19, 2019
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
by ecogoth December 30, 2020
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2
like fantastic but much cooler with much more emphasis. it must be pronounced with emphasis too. it is most commonly used in, but not limited to, the discussion of lady parts and/or lesbians.
The vicar of Dibley, Geraldine, said to Alice that shagging model Rachel Hunter would be 'fannytastic'.
by me old fruity November 06, 2006
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3
something thats just sooo good its better than fantastic its FANNYTASTIC!
have u seen that subaru?
yeah its fannytastic!
by Oo Oo Oomonkeys June 12, 2004
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5
a word used instead of fantastic to show how FANNYtastic something was.
last night was so fannytastic!
i cant remember a thing!
by its_groot February 18, 2009
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