The title adopts 1940s hipster slang coined by Raye's friend, Ray McKinley, a drummer and lead singer in the Jimmy Dorsey band in the 1930s. McKinley kicked off certain uptempo songs by asking pianist Freddie Slack — nicknamed "Daddy" — to give him a boogie beat, or "eight to the bar". For that reason Raye gave partial songwriting credit to McKinley. (The song was formally published under McKinley's wife's name, Eleanore Sheehy, because McKinley was under a songwriting contract with another publisher.) The nickname "Daddy Slack" was also used in the 1941 recording by "Pig Foot Pete" with Don Raye singing in Slack's band.