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Generally used to describe a gay man (possibly a gay woman) who is in a great mood, exuberantly hyper, and acting extremely flamboyant (more so than usual).

Denotes a hyperactive and very happy mood contingent with flamboyancy going off the scale.

May also be used to describe animals, days, or moods in general.
"He wouldn't quit smiling, cracking sex jokes about boys, nor jumping off the walls, he must have been having a hyperfagtastic day!"

"She is hyperfagtastic!!!"

"Today is going to be super hyperfagtastic!"
by Mr. Hyperfagtastic April 14, 2010
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