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Very humorous, short for "f*cking/friggen hillarious". Often used when accidentally when trying to say very funny.Used when story telling or explaning funny events..
"Dude, did you see that kid in Math class? He friggen pooped his pants. It stunk like hell, but it was fillarious."

"Wow man, I just saw scary movie. It was fillarious"
by Cree Devinto March 21, 2007
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Apr 21 Word of the Day
I've been jabbed
by Francesco II March 20, 2021
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