"Most of us want to go."
Translation:우리 대부분 가고 싶어요.
대 comes from the hanja 'big' and 부분 means 'part' so 대부분 means 'majority' or 'the most part of something'
It can come before or after. I haven't noticed if it happens more one way or another though. If it comes before you can add ~의, like 대부분의 지역 (most of the region), but as usual the article is often dropped as well.