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 18, 2012
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when two guys poop into each others butthole, a type of fetish
larry and robert love foiling with each other
by robbieboy77 June 26, 2009
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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 6, 2003
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1. (v.) To publicly humiliate or embarrass someone. To prove someone wrong in an embarrassing manner. Synonymous with "own" or "pwn."
2. First. Outside. Inside. Last (A rule for binomial multiplication in mathematics.)
3. A thrusting weapon used in fencing.
4. In Australia, a foil, is a $25AUD deal of weed.
5. A $20nzd deal of marijuana wrapped in tin foil,around 10grams. Also refered to as a tinny.
1. HP really foiled Falc by posting his gigantic rambling love letter to her for everyone else to see on the internet.
2. You want a math example? Seriously? Give me a break.
3. He scored a point by putting the point of his foil on his opponent's torso.
4. "Do you sell foil's?"
5. "Yo, do you know where I can score me a foil?"
by Will the Awesome April 21, 2007
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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.
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when a friend is having intercourse you and a group of friends cover your faces in tin foil and barge in on the couple while they are doing the deed
snap I was doing a girl on the toilet and they picked the lock and foiled me!
by B nathe April 26, 2008
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A reference to the Americas Cup AC75 boat class. When this sailing boat is gliding on its hydro-foils they can reach speeds of 93km/h.
“I drank a dozen beers and pulled two blondes back to my hotel! I was fucking foiling!”

“What happened to you last night? You skulled that vodka and vomited on my mums Persian rug”
“Sorry mate, I fell off my foils
by Professor Sless April 26, 2021
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