noun
noun, orig and mainly US military
1:
a: An inept or stupid colleague, esp. a trainee; also, a member of the US Marine Corps. (1967 —) .
b: An enemy soldier, esp. a North Vietnamese soldier in the Vietnam War. (1978 —) .
2: US medical A difficult or disagreeable patient, esp. an elderly one. (1972 —) .
[From the name of Gomer Pyle, a comic yokel character who originally appeared on US television in (1963) (in The Andy Griffith Show).]