1Grotesque or absurd ornamentation, carving or pictures; an example of this. Compare "baboon" babery historical after Middle English.
2Originally: †a colony of baboons (obsolete rare). In later use: a captive collection of baboons.
3Baboonish nature, character, or behaviour; especially foolishness, stupidity.
Late Middle English; earliest use found in Aelred of Rievaulx's De Institutione Inclusarum. From baboon + -ery.