Wack or Whack may refer to: People Gerhard Wack (born 1945), German politician Henry Wack (1875-1955) attorney; author; apologist for Leopold II's misrule of the Congo Free State Pierre Wack (1922–1997) was an unconventional French oil executive who was the first to develop the use of scenario planning in the private sector Tierra Whack (born 1995) an American rapper, singer, and songwriter Arts, entertainment, and media WACK, a radio station in Newark, New York WACK! Art and the Feminist Revolution, a feminist art exhibition and book Whack, a short-lived St. John Publications comic book (1953-54) Whack Records Wrestling Association of Championship Krushers (WACK), a children's television show WACK, a Japanese music production company Other uses Wack, adjective, slang (from "whacked") for oppressive, crazy, stupid, poor quality, unfashionable. As a verb, it means to kill. Slash symbol "/", sometimes known as a whack Windows App Certification Kit (WACK) See also WAC (disambiguation) Whac-A-Mole, an arcade game Wacke, or greywacke, a type of sandstone Wacker (disambiguation) Wak (disambiguation) Wank (disambiguation) German-language surnames