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1.
(adj.) a word used to express one's complete and total satisfaction about one, or many, instances.
teacher: Does anyone know what a synonym for amazing is?

Jack: FANTASMINATICALLLL!!!!

teacher: Umm, sorry, that's not a word, love.

Jack: yes it isss! it's in the urban dictionary! look it up!

teacher: Alright, next word does anyone know the synonym for...

-Look up radtastical to find the next chapter in our fantasminatical story.
by bleyw&trippy January 08, 2010