Going full Pumi Naka means committing to the attempt before every detail is settled, then learning live and making the best version from what happens next.
It is not pretending to be prepared
The funny part is the honesty. Someone going full Pumi Naka does not act like a master strategist. They know the plan is thin. They still take a small, recoverable step.
When to say it
Use it when a friend starts a tiny project with too much courage and not enough instructions, when a first draft becomes strangely good, or when an improvised fix solves the problem.
Going full Pumi Naka should feel affectionate, not insulting. It points at the charm of trying, not the failure of planning.