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1.
Originally a mathematical term. Denoted as "4!" and read as "four factorial," it's the product of 1x2x3x4=24.

Heard used when describing someone whose clothes are about 10 sizes too tight: "Yo, she ain't no size four, she's a size four factorial!"

Originating in the Manayunk area of Philadelphia, PA, as well as the Philadelphia suburb of Phoenixville, PA, as a word to describe anything or any situation as totally outrageous or ridiculous, it is quickly becoming adopted as colloquialism all over the Philadelphia metro area.
1.) "Steve ate an entire pizza last night when he was drunk. he's fucking factorial"
2.) "We don't need no factorial bitches up in here" (for added effect, the word "bitches" can be replaced with "betches").
3.) "My boyfriend caught me checking out another guy and went totally factorial on my ass."
4.) "We got drunk at the bar last night, and I have no idea what happened after that. It was a totally factorial night"
by Four Factorial Betches November 25, 2006
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