It's a German word meaning man and in the Yiddish use has the connotation of honorable man?
I no longer have my German language dictionary(-ies) or Duden books nor access to such where I am, sadly.
(The neutral version would be מאַן, which literally means man or husband.)
(For those wondering: “man” in Yiddish looks a lot like “mohn”, which is the same as German mohn.)
:)
https://en.wikipedia.org/wiki/Mensch
Jewish, not of German ancestry, but I've had a lot Yiddish spoken around me.
Capitalization is very important here! Also, e.g. if you are helping your uncle Jack off a horse, etc.