When you can code thousands of lines but is lost of words when trying to communicate to humans how you did it.

I find it pretty difficult when I'm asked by my client : so how did you do it and what sort of things does it require?
I'm like, right so I've used 2 dimensional array with recursive iterat...
Right okay just stop, I don't understand
What's the point in asking anyway?

Albert Einstein: "if you can't explain it to a six year old, you don't understand it well enough yourself."

Being able to explain what you do is a very important and useful skill if you plan to ever work on a team or step up your career level. I believe I just read an interview with the CTO of Stack Overflow where he explained that above the ability to code well, he would place the ability to communicate well.

@Seethe I disagree with that. Explaining thought process and explaining how you did something are two different things.
I can explain in detail my thought process on how I would go about solving a problem.
But explaining code or mathematically premise to somebody with no quantifiable knowledge of either of the subjects is difficult.
It requires a certain type of skill.
Not possessing the skill in my opinion doesn't mean you don't understand it yourself.

@compSci I agree to disagree with @Seethe