A stout, oblong, wooden cudgel approximately 12 inches in length used by the Irish mob as an interrogation aid. The subject is often bent over a bar with their pants down, while said object is placed firmly against the rectum for "leverage". The further implied uses of the probe are clear.
Ya' feel that there Tommy boy? Ya knows what that is, now don't ya'. Right you are lad, it's me old ass cudgel. Now I'll only be asking ya' this one time boyo....