Five-O

Noun / UK Slang / US Slang

Five-O is a term used to describe the police. It is often used informally to alert others to the presence of law enforcement. The term is particularly used in the United States, but also reached the UK.

Example: “Five-O is coming, run”
Means: “The police are coming, run.”

Example: “Keep an eye out for Five-O while we’re here”
Means: “Watch out for the police while we’re here.”