the opposite of simple, authentic and true: desperately exquisite, contrived to the point of ridiculousness, trying to so hard to be ornately exceptional that you (inadvertently) end up looking like a clown. A good example is mega-artist Matthew Barney, whose films are so self-involved and obscurely referential that they seem about to burst and disappear in a multidimensional clench. His wife Bjork also fits the frame (yes she does). Most runway fashion show pieces are also a fine demonstration of the palace of twee: preening to the most self-absorbed and aloof of the lot, completely devoid of true passion. Most "artist statements" in today's art world are also laughably twee: buzzwords and effete constipated embellishments over nothing at all. Also can mean overplayed cloying sentimentalism, artificial exaggeration of feeling, grandstanding epicness, narcissistic saturation. See again Bjork.
Evanescence (pop band) are so goddamned twee, like sucking on a lollipop made of pure nutrasweet, god I wish an elevator would fall on her throat.