To set up everything completely, precisely, and perfectly. Usually relating to something mechanical or creative. The phrase comes from tuning engines. Mechanics set contact points for the electrical system of the engine and then "dial in" the timing so it will run perfectly.
If we're going to take the whole engine apart, let's get some new parts and dial it in before we put it back together.

Can also be used in other tenses and variations like:

I'm going to dial in that letter to my landlord before I send it out.

That bike needs to be dialed in before we take it to the track.

I was dialing it in yesterday so that it would be ready for the trip.
by slambert11 January 22, 2009
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"Hooked Up"

Origins traced back to eletric guitarist slang... referring to fixing of the guitars for someone... be it through tweaking the dials or turning the knobs that tighten the strings.
"Espo wants a cheesy beef from Cavones. Fuckin'.. dial it in!"
by Mike September 15, 2004
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to be absolutely focused/ mostly referencing a send
Adham was fucking dialed in last Saturday
by Kyle Foregard June 22, 2021
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a situation, event, person, or even a BMX trick that is, or was done perfectly. Derived from Derek Girard, FBM.
Dude, jeff, your Mom is dialed!

by littlejoey August 10, 2007
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To have a sequence or procedure mastered to where it is almost second nature.
I beat Ganon so many times that summer, I had the whole game pretty much dialed in.
by Ash April 26, 2005
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