finger fuck /ˈfɪŋɡɚˌfʌk/noun 1verb 1forms 3 noun1 •(slang, vulgar) The act of fingering; using or inserting one's fingers into another person's genitalia, anus, or other part of the body to stimulate them sexually. verb1 •(slang, vulgar) To finger; insert a finger into a person's genitalia, anus, or other part of the body to stimulate them sexually. formsfinger fucked · finger fucking · finger fucks