A full-body massage indicates that the therapist will massage your whole body during a therapeutic massage lasting at least 50 minutes. That's the amount of time needed to massage all the major areas of your body -- back, shoulders, legs, feet, arms, hands and neck.
Men get a nice pectoral massage, but women have to go to Europe for that. You generally start face down and the therapist starts with your back and shoulder, then moves down the body. Once you flip over, the therapist works her way back up your body, usually ending with neck and shoulders and sometimes the scalp.