What does "sácala pues" mean to someone in Mexico? Is it slang for how's it hanging? Or how's it going?
It's not "saca la pues", it is "sácala", that literally translates to "bring it out".
This can be used literally to bring something out or also as a rude way to challenge someone, normally referring to a gun or anything referred to someone's manhood, I think you can guess what it means.
The "pues" is something like a "come on" used to urge someone to do something.