pouter pigeon
/ˈpaʊtə ˌpɪdʒ(ɪ)n/noun
1A domestic pigeon of a breed characterized by a greatly inflatable crop. Also figurative : a boastful or arrogant person, a show-off.
2Attributive Resembling (the inflated crop of) a pouter pigeon.
Origin
Late 18th century; earliest use found in William Smellie (1740–1795), printer, editor, and author. From pouter + pigeon.