A group of government hired, badly trained but well paid gangsters who project their anger towards the citizens.
They are so called HONG KONG POLICE FORCE
The main reason why they being called popo is that it sounds like a dog name and they behave like dogs with rabies.
(Hong Kongpolice coming out on the streets.)
Citizens: FUCK THE POPO
RESIDENTS: FUCK OFF YOU KILLERS AND RAPISTS
Popo: (barks) (firing tear gas and rubber bullets)