No Bullet (way of life):
No (magic) bullet: no easy fix to the problem, power through
No Bullet (left): Giving all you have, i.e. firing all bullets in the chamber and not leaving one for yourself.
No Bullet (to bite): Rely on your own will power and determination, no outside push is needed to do what is required.
USE: Friend: This workout is going to kick my ass.
Me: No Bullet, Man!