"Fembot" is the term used to describe a female robot. It is thus the opposite of "manbot", which describes a male robot.
According to Professor Hubert J. Farnsworth, the differences between the two robot sexes are "ill defined". The main difference between them being their type of oil, and apparent design of the robots to emulate the human sexes. For manbots, the interior of a fembot would be the same as a nude human woman for a human man.