

“world police” means doing police work at a global level.
Police fundamentally exist so that individuals can outsource their security to the state. Police disincentivize coercion by maintaining the ability to do violence and doing violence on those who use violence. It allows individuals to not have to think about physical in order to move freely.
“world police” means one country’s military defending other countries so that those countries don’t have to maintain a military or handle their own security.
The meaning of the phrase is inherent to the phrase’s word: it just means playing a police role (punishing aggression between third parties to maintain a peaceful atmosphere) for the world (planet Earth).
I most certainly was not.