It has a lot of meanings.
The oldest one I know of is that of Monkey King, who in the ancient story stole and ate the peaches of immortality. He did this without any plan; in some versions he was hungry and didn't understand that it would make him immortal. This act of spontaneity also inconvenienced the peach owner, who had intended to serve the peaches to those who were worthy of them.
Since then various martial arts moves and stories and so on were named after that one little bit of the story, usually to showcase a combination of spontaneity and strength.
All teachers discuss getting a difderent job. Sometimes they quit rather suddenly when the job arrives. None of us hide the general search from each other but often hide the interviews. None of us need excuses to want another job, everyone knows the job sucks.
Incidentally: If you have to work two jobs at once, then there is something wrong, mate. There's no way I could work a second job while teaching.