The act of having sex, usually penetrating the human orbital socket with the erect penis. To defile the human skull by performing a sexual penetration to the area of a missing eye. Also see skull fuck
A sledgehammer. The term suggests a lack of finesse in Irish repair methods, reinforcing the Irish reputation for stupidity.
Having thus far failed to repair the television, Jim switched from his screwdriver to his Irish socket set - a decision probably driven more by frustration than careful consideration.