chicken head
[Commodore] n. The Commodore Business Machines logo,
which strongly resembles a poultry part. Rendered in ASCII as
`C='. With the arguable exception of the Amiga (see amoeba),
Commodore's machines are notoriously crocky little bitty boxes
(see also PETSCII). Thus, this usage may owe something to
Philip K. Dick's novel "Do Androids Dream of Electric Sheep?"
(the basis for the movie "Blade Runner"; the novel is now sold
under that title), in which a `chickenhead' is a mutant with
below-average intelligence.