Definition of popinjays:
(n) :
(dated) A vain, gaudy person; someone who is shallow or superficial.
(n) :
(archery) A target to shoot at, typically stuffed with feathers or plumage.
(n) :
(UK) The green woodpecker, Picus viridis.
(n) :
(now archaic outside heraldry) A parrot.
(n) :
(obsolete) A decorative image of a parrot on a tapestry, cloth etc.