Top Definition
If something was completely unbelieveable/inconceivable, sometiems someone will exclaim "Sif!", a word used in internet circles. This word could be used when describing the situation of when the exclamation occured.
"The Sifness was so mindblowing, I was like, wow, that frood must be leetzor!"
by KinGAleX March 21, 2005

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