The concept of being the part of the universe Very respectfully,i am very much new to this community but have always been interested in Buddhism. I know some people who are Buddhist and they often talk about being one with the universe or being the part of it, literally. How does that work? I mean are we born from universe and when we say the word "universe", what exactly do we mean?
"I mean are we born from universe and when we say the word "universe", what exactly do we mean?

The idea (or what is discovered) is that we are in a sense born from the universe (in a way this is obvious) but it may be better to say we are the universe. It could even be said we are not born at all. Even the statement 'we are' would be denied.  

If 'Universe' means 'all that exists' then this is not a Buddhist meaning of the word since it would leave out the source of existence. This source would real where all else would be created thus not metaphysically or independently real. The Buddhist 'universe' is bigger than the universe of physics since it includes the totality of Reality and Appearance or both of Nagarjuna's 'two worlds', but also smaller since space-time and its contents would be reducible. 

Hence the Buddhist Universe is a fundamental concept where the scientific concept is non-reductive. This would be why Buddhism has a coherent metaphysic while physics cannot find one. How we define 'universe' is therefore important. If we follow the scientists and say it is 'all that exists' we will have no hope of a fundamental world-theory.