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- Wallopers
- Australian, from "wallop", meaning to hit or beat.
- Whoop-Whoop
- US, slang, from the Southern States & New York City, in reference to a patrol car's siren.
- Woodentops
- UK, derogatory, used by plain-clothes officers in reference to the uniformed branch. Possibly a reference to the 1950s children's TV series The Woodentops, declining use.
- Woolly-backs
- UK, derogatory, used by plain-clothes officers in reference to the uniformed branch.
- Wasps
- UK, derogatory, from the recent adoption of Safety Yellow jackets by various Constabularies for uniformed officers in various roles, as with Bluebottles, from the "swarming" of officers at an incident. Also used in Washington state, United States in reference to the Washington State Patrol.
Read more about this topic: List Of Police-related Slang Terms