two finger split 

When fingering a girl, the action of using the index and ring fingers to open her up--which can be on the surface or after insterting the two fingers--allowing for the insertion of middle finger

I gave her the two finger split

two finger split by futballa November 24, 2007

split finger fastball 

when you three fingerblast, pinky analblast, and thumbdiddle all at the same time at a rapid speed

She got a hard split-finger fastball resulting in an incredible orgasm

split finger fastball by killertherand November 27, 2003

split finger whisker biscuit

slang term for pussy

You should have seen her split finger whisker biscuit

split finger whisker biscuit by Pedro420 July 19, 2007

Split finger fastball 

When you make the peace sign while inside her pussy and you rapidly teabag her forehead til she passes out

I gave this girl a split finger fastball and after three strikes she was out

Split finger fastball by DeRayLa June 16, 2022

Finer than a dog's hair split three ways 

Means that something is very fine, or that you feel excellent. If someone asks how you feel and you simply say "fine", you might just be saying it out of convention. Adding the "dog's hair split three ways" shows that you actually mean it.

Another form of the expression is "finer than a frog's hair split three ways", although literal frogs do not have hair.

You: How are you doing today?

Me: Why, I'm doing finer than a dog's hair split three ways!

Finer than a dog's hair split three ways by JCEG November 25, 2006