english
1
general::
Phrase(s): dead from the neck up 1. Fig. stupid. (With a "dead" head.) • She acts like she is dead from the neck up. 2. Fig. no longer open to new ideas. • Everyone on the board of directors is dead from the neck up.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Extremely stupid, as in That news commentator sounds dead from the neck up. This expression alludes to being "brain-dead." [Early 1900s]
American Heritage Idioms