Grotesque or absurd ornamentation, carving, or pictures; an example of this.
Johnson (1755) gives the definition: ‘finery to please a babe or child’, which is followed in some later dictionaries..
Origin
Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. Originally perhaps a variant (with loss of medial -n-) of baboonery. In later use probably originally a variant of the some forms with reduction of the second syllable, probably reinforced by reanalysis as showing babe or baby + -ery.