What does "your guts" mean in this context?
SCRIPT
Mike: "I'm sorry about before, shoving you, I didn't mean to."
Mr. Shaw: "I'm not going to break. I'm sorry too, for questioning your commitment, your guts. I know better than that."

QUESTION
What does "your guts" mean in this context?
I think it's kind of a slang word, isn't it?
Anyway, I'm gonna wait for your answer.
Thanks in advance~!

Question

What does "your guts" mean in this context?
SCRIPT
Mike: "I'm sorry about before, shoving you, I didn't mean to."
Mr. Shaw: "I'm not going to break. I'm sorry too, for questioning your commitment, your guts. I know better than that."

QUESTION
What does "your guts" mean in this context?
I think it's kind of a slang word, isn't it?
Anyway, I'm gonna wait for your answer.
Thanks in advance~!

Answer

Here it means bravery/courage.

Answer

Guts means courage. 
People say you feel nervousness in the stomach, the GUTS, so they say you need to HAVE guts to be brave.

They're really saying, ignore the nervous feelings in your stomach and be brave.

Guts of steel, steel guts.
Steel myself up.

He's gutless!!!

Etc

From War time, I think, and I think it's American.

Answer

in a part of the text there is a hint; the "commitment" helps you get the meaning of the rest.

i think it is not an idiom it is "the essential power or effectiveness of a person" ; the bravery. :)

Answer

Why can't I thumb up Beth?? Hehe.........I'm trying to give her a thumbs up and it only shows me the thumbs down?

Answer

I agree with Beth. "Your guts" is not slang, but common speech. There is a big difference.