This is a fast-paced online expression.

It first appeared in Jiangsu Satellite TV's program If You Are the One. At that time, a contestant named He Ge spent about 12 seconds introducing his information during the self-introduction session, which was greatly appreciated by the host and became the focus for a while. After that, the word "12-second brother" spread on the internet and became synonymous with describing a person's extremely fast action or speech.

For example, someone who finishes a task very quickly may be described as "Brother 12 seconds"; A product launched by a company has a quick response, and it may also be described as "12 seconds brother".