I do not even know what Nosh is If it is English, It is incredibly uncommon, at least where I"m from

I would eating not noshing. As a native English speaker living in Canada I have never heard the word "noshing" used before. Eating is the common choice.

'Noshing' is more of snacking on something like potato chips or eating a light meal. You could replace nosh with eat but not necessarily the other way around. Ex. "He's noshing (on)/eating potato chips." "He ate chicken with gravy." I wouldn't use 'noshed' here.

xarmanla, your comment made me laugh. I guess we're in good company. Although I've never heard of "nosheri", the food itself was just called "nosh".

It comes from Yiddish. Why are you noshing on candy bars when you know that dinner is in an hour? Food consumed by "noshing" is often called "nosheri". When my neighbor's father returned home from work he would ask his wife for some nosteri to hold him until dinner.