Decorated or adorned with cheap, showy trinkets or ornaments in a flashy but tasteless way.
From gewgaw (a showy but worthless trinket) plus the past participle suffix -ed. Gewgaw itself is of uncertain origin, possibly derived from imitative or reduplicative roots, first appearing in English in the 16th century as a word for frivolous baubles.
The word gewgaw perfectly captures that feeling of Victorian excess—those ornate parlors crammed with useless little decorative objects. It's one of those rare English words where the sound perfectly matches the meaning: the bouncy double syllable feels as lightweight and silly as the objects it describes!
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