What does TISF stand for?

MLA style: "TISF." Acronym Finder . 2013. AcronymFinder.com 23 May. 2013 http://www.acronymfinder.com/That-Is-So-Funny-(slang)-(TISF).html
Chicago style: Acronym Finder . S.v. "TISF." Retrieved May 23 2013 from http://www.acronymfinder.com/That-Is-So-Funny-(slang)-(TISF).html
APA style: TISF. (n.d.) Acronym Finder. (2013). Retrieved May 23 2013 from http://www.acronymfinder.com/That-Is-So-Funny-(slang)-(TISF).html

That Is So Funny (slang)

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