CSI (slang) Type: noun, slang, acronym Pronunciation: /c-s-i/ Also spelled: C.S.I., C-S-I What does CSI mean and stand for? Crime Scene Investigation. Example sentence: “The police were talking about a CSI.” CSI in songs: “A suit and tie is suitable and usual in suicide CSI just might investigate this fucking parasite” – Kendrick Lamar, Rigamortis. […]