P.O. (acronym) Type: noun, acronym Pronunciation: /P-O/ What does P.O. mean and stand for? Probation Officer. P.O. is short for Probation Officer. P.O. Synonyms: Feds Example sentence: “My boy P.O. be on his ass.” P.O. in songs: “Tell your P.O. how-how long you been high? All day, nigga” – Kanye West, All Day. “Fuck the […]