The word "得瑟" is formed by combining the character "得", which here functions as a phonetic and grammatical component without its literal meaning of "obtain", and "瑟", which primarily contributes phonetically to mimic a casual or frivolous sound or gesture. Together, they create a colloquial term used to describe someone showing off or behaving in a conspicuously arrogant manner, with the meaning arising from the combined sound rather than the individual meanings of the characters.