Definition of gomer:
(n) :
(slang, derogatory) A stupid, awkward, or oafish person.
(n) :
(US, military slang, derogatory) An inept trainee or serviceperson.
(n) :
(medical slang, derogatory) An undesirable hospital patient, or a patient who does not need medical care.
(n) :
(slang, derogatory) A dirty, senile, or otherwise unpleasant patient.
(n) :
(slang, informal) A patient who does not respond to medical treatment.
(n) :
A conical chamber at the breech of the bore in heavy ordnance, especially in mortars.