Top Definition
To have a plan thwarted.

Foiled takes the dual meaning of "To prevent from being successful", and the mathematical mnemonic FOIL, which stands for "First, Outer, Inner, Last"; this device is used to multiply two binomials.
"Our plot to throw off the competing trivia teams by changing Wikipedia entries was foiled like binomials when our network was banned by the zealous encyclopedia editors."
by mathlete April 12, 2008

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