Top Definition
First. Outside. Inside. Last
Foil gives me great pleasure in multiplying binomials.
by Omikron October 02, 2005

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A thrusting weapon used in fencing.
He scored a point by putting the point of his foil on his opponent's torso.
by The Professor November 07, 2003

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(v.) To publicly humiliate or embarrass someone. To prove someone wrong in an embarrassing manner. Synonymous with "own" or "pwn."
HP really foiled Falc by posting his gigantic rambling love letter to her for everyone else to see on the internet.
by dantehicks3737 February 14, 2005

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In Australia, a foil, is a $25AUD deal of weed.
"Do you sell foil's?"
by Diego July 26, 2003

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Stands for First Outer Inner Last

A math acronym used for multiplying binomials.

This is known to the world as the best math operation known to man. It is by far the most useful, this is a scientifically proven FACT and should not be disputed by anyone, ever. Doing so is punishable by death.
Courtney - "Did you hear the Bobby does not like to FOIL?"
Abbey - "He should be killed, because that is punishable by death..."
by Steve Perry! January 17, 2012

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The face you make when a guy is doing a great job at eating your roast beef sandwich. Commonly known as cum face and looks like a crinkled aluminum lid from Chipotle or just some good old wrinkled aluminum foil. It usually occurs when your man is eating you out like a McRib and slurping your Happy Meal Milk like some BBQ off of his fingers.
Girl, Alyssa told me that Aaron made her foil all night long. The wrinkles on her forehead must match the scratch marks on Aaron's back from the night before. They are both deep and full of sexual passion.
via giphy
by UpNextVanillaSwirlOnThePole March 07, 2017

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An individual package of heroin wrapped in foil, usually of a 10$ value. Foils are sold on the street and through drug dealers. Usually yields 3 to 4 decent-sized lines, providing your dealer isn't a fuck..
"dude, I am fiending hardcore, do you have any more foils?"
by Matt December 05, 2003

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