Im gonna clean your clock

Im gonna clean your clock is the thread to hit someone in the face. You may also recognize it when used in different terms such as when someone says they got clocked; it means they got hit or punched in the face. Clock faces have long since been associated with human faces which is part of the reason this phrase means to hit someone in the face. While not common to be spoken in everyday conversation, you have more than likely heard it during an older movie, usually a crime solving or action type.