A person who's sole self purpose in life is to work hard and achieve until the day they die, never stopping to enjoy their achievments or see the world around them. Everything comes second to work and because of this their friendships are torn and love life is darker than the dark side of the moon
Basicly a person with no life, so they decide to try and fill the gap of having no life by working ALL THE TIME. This generally does not work and people who turn into workaholics are usually unmarried over-ambitious women and over-ambitious men
An example of a workaholic is someone staying in the workplace after their designated shift despite not having anything important to do.