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Gotta Go Fast

Refers to a Tool Assisted Speedrun (TAS) of a Sonic game.
The TAS gave a new meaning to Gotta Go Fast.
by Zde829 December 26, 2021
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Fast Fap February

FFF is when every day for this month you masturbate until you can ejaculate. You time how long it took to ejaculate and at the end of the month you compare and look for the fastest time you can ejaculate. Basically a speedrun to cum.
Person 1: Dude, you know it's Fast Fap February, how fast did you cum?
Person 2: It took me 20 seconds
Person 1: Damn it took me 5 minutes
by Yomamaha January 5, 2022
mugGet the Fast Fap Februarymug.

Fast food Mommies

Women that target men that work in the fast food world for their free food benefits.
Them Fast food mommies be macin for them big macs.
by Use someone else's name June 20, 2023
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fast forward equity

Time saved when pausing a dvr recording.
Oshit we're all out of fast forward equity now we have to watch a stupid commercial
by BigZac April 28, 2016
mugGet the fast forward equitymug.

Fast Food Restaurant

McDonalds- Crappy burgers, good shakes, and amazing fries.
Burger King- Amazing burgers, good shakes, crappy fries.
Wendy’s- Crappy Burgers, Crappy Shakes, Crappy fries
by ESBirdnerd December 5, 2020
mugGet the Fast Food Restaurantmug.

fast-slow food

A place that serves "home cooked" food in 12 minutes or less. Not a food cart.
I only have 30 minutes but I want some good fast-slow food.
by Kinch_Dedalus June 25, 2014
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Fast Growing Hierarchy

The fast growing hierarchy (shortened to FGH) is a method of defining large numbers. It takes in two inputs.

We define f(0,n) = n+1. For example: f(0,3) = 4. Next step is iteration. f(1,n) is f(0,f(0...f(0,n)...)) where f(0,...) is iterated n times. For example, f(1,2) = f(0,f(0,2)) = 4. Same rules for f(m,n).

Now let's define what ordinals are. Very simplified, they're a kind of infinity.
Consider this: |||....|

This has infinite sticks, but there's a 1st stick, 2nd stick... the last stick is the ωth stick. You can have ω+1, ω+2, ω+3 etc too. For our purposes, a limit ordinal is an ordinal that has no finite part at the end (so ω+3 is not a limit ordinal but ω×3 is.).

So how can we use this within FGH? We need to define a fundamental sequence (FS). An FS is the steps we take to reach a new limit ordinal. So the FS for ω is 0,1,2... and for ω×2 it's ω,ω+1,ω+2...
We can write this as: ωn = n, ω×2n = ω+n, ω^2n = ω×n and so on. There are more ordinals, but it'll do for our purposes.

This is not the only system for an FS. There's more, but I cannot fit it in an entry.

Now consider an ordinal α. Now FGH can be defined concretely:
for f(α,n):
if α is 0, it is n+1.
if α is not a limit ordinal, it is f(α-1,f(α-1...f(α-1,n)...)) where f(α-1,...) is iterated n times.
if α is a limit ordinal, it is f(αn,n).

Let's do an example: f(ω,3) = f(3,3) = f(2,f(2,f(2,3))). I know that f(2,n) = n×2^n, so it's 1.804356 × 10^15151336, which is HUGE! Imagine how large f(ω,10) is.
Graham's Number is approximately equal to f(ω+1,3) within the Fast Growing Hierarchy.
by cyclopentane December 1, 2022
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