What word or phrase does your mother always say?
demented de·ment·ed (dĭ-měn'tĭd)
Mentally ill; insane.
Suffering from dementia.
Yet another term of disgust used to describe a program. The connotation in this case is that the program works as designed, but the design is bad. Said, for example, of a program that generates large numbers of meaningless error messages, implying that it is on the brink of imminent collapse.