Stand up guy

[Sonia]

Mafia term A good solid man business man. not one to bullshit, can be trusted. Will do anything needed for his family.

[Sarah]

Meaning

A loyal and reliable friend.

Origin

The allusion is to someone who would be prepared to stand up and fight on your side if called on, i.e. one who, in the words of the earlier (late 19th century) phrase, would stand up and be counted.

The phrase is American. The earliest citation is in the Pennsylvania newspaper The Charleroi Mail, April 1935:

[Mark Zuckerberg]

trustworthy fella you can count on in any predicament

[Britney]

Zack Joseph. He hates what he believes and loves it at the same time. Hes Tylers brother, and his heads screwed up, but thats alright. |-/

[Donald Trump]

Someone who wont give up anything under interrogation.
Standing up to questioning.

[Thomassew]

A stand up guy is someone who is reliable, trustworthy, and will stand by their principles and commitments, even in difficult situations. They are known for their integrity and willingness to help others. This phrase can be used to describe someone who is admired for their strong character and dependability.