"Anal" and "anal retentive" is usually used to refer to someone who is uptight about cleanliness, order, procedure, etc.
It stems from the idea of the "anal" stage of Freudian psychosexual development. According to Freud, babies learn to achieve gratification from the control of their bowels. An interruption in sexual development at this point will result in either "anal retentiveness"--which means adult pleasure is derived from order, control, and environmental stability; or "anal expulsiveness" which means than satisfaction is derived from chaos, disorderliness, and unpredictablity.
Note: this was all dragged out of my long-term memories from Psychology 101. If I'm wrong about any of this, please don't hold it against me.