Top Definition
a math shortcut fo dividing fractions
Keep-first fraction
Change-the sign from division to multiplication
Flip-the last fraction

teacher: how do we divide fractions?
students: we use KCF
by smart-@$$ November 24, 2007
short for Keychain Friend
"Karolina is my KCF"
by METRObliss August 16, 2009

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