a stand-up guy 

A stand-up guy is someone whom you can trust; a trustworthy person; a reliable person who keeps other people's secrets.

Hooman is such a stand-up guy. Everyone in the class confides in him. His lips are sealed and you can't get a word out of him.

a stand-up guy by rashouri October 2, 2013

Stand Up Guy 

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

AL: Should I worry that donnI is going to jack me on this deal?

Mikey: Donnie is a stand up guy, I trust him with my life.

Stand Up Guy by icedoutgear.com Dave April 25, 2006

stand up guy 

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:

"But he seems to be a stand up guy and loyalty, with him, seems to be less a virtue than obsession."

stand up guy by Dixon St. Grottlesex. November 5, 2009

stand up guy 

trustworthy fella you can count on in any predicament

Oh course James Bridges can be counted on if you are in a bind. After all, he IS a stand up guy.

stand up guy by F0ShizzleNizzle December 16, 2010

A Real Stand Up Guy 

A solid buisness man. Does not take any bullshit. The life of the party. Will help others in times of need. But will only do this if it benifits him in return. Would stand you up if more important matters came up.

Wow Jeb is a real stand up guy.

A Real Stand Up Guy by students77 January 28, 2020

Stand Up Guy 

Someone who won't give up anything under interrogation.
Standing up to questioning.

Cop: Awright asshole, where'd you get that illegal substance?
Guy: I dunno what that is or how it got there. Never seen it before.
Cop: Oh yeah? We're gonna lock up up and throw away the key if you don't tell us where you got that stuff.
Guy: I don't know NOTHIN' about it!

Dig it, you are a stand up guy!

Stand Up Guy by Straight Shooter October 16, 2007

stand by guy

A guy (usually a friend) that is constantly on stand by for a girl's attention. He is either her second or third choice because she knows he is always available.

Jenna wanted to hang out with Dave but he was busy, so instead she hit up her stand by guy MC.

stand by guy by SuaveCat August 5, 2014