He's referring to a name of an old mystery/suspense radio program that ran from 1941-1952. It was famous for having a sound effect of a creaking door.
He was babbling in the same style of the famous Lucky Strike tobacco auctioneer: L.A. "Speed" Riggs, heard on radio's "Your Hit Parade" at the time of this cartoon's release. Also a frequently used Looney Tune impersonation.
