One of the mysteries of the English language finally explained.
Of a person: tending to act instinctively, spontaneously, or expediently. Of an activity: done on the basis of practical experience rather than technical knowledge; informal; inexact.
1930s; earliest use found in Popular Science Monthly. From seat + of + the + pants, after by the seat of one's pants.
In this article we explore how to impress employers with a spot-on CV.