Hot answers tagged dialect
It used to be quite local in the northeast, but now gets used all over the places. It can mean showing off, attracting attention deliberately, and/or doing something without considering the impact. It's an informal but quite popular word now.
I believe the core of the meaning is overly expressive with gallantry or proudness. Although the most common usages are when guys showing off in front of girls, it can be used in other contexts as well. For example if someone keeps talking proudly about some small deed to his friends, they may react with '你今天怎么这么嘚瑟？', which could be a neutral question, or ...
Only top voted, non community-wiki answers of a minimum length are eligible