EDIT: Yes, Nathan Rabin coined “Manic Pixie Dream Girl” in the first part of his series “My Year of Flops,” which was Elizebethtown.
“[Kirsten] Dunst embodies a character type I like to call The Manic Pixie Dream Girl (see Natalie Portman in Garden State for another prime example). The Manic Pixie Dream Girl exists solely in the fevered imaginations of sensitive writer-directors to teach broodingly soulful young men to embrace life and its infinite mysteries and adventures. The Manic Pixie Dream Girl is an all-or-nothing-proposition. Audiences either want to marry her instantly (despite The Manic Pixie Dream Girl being, you know, a fictional character) or they want to commit grievous bodily harm against them and their immediate family”