noun
girl who puts on airs; affected girl
Derived from 気取る (to put on airs). Refers to a girl or young woman who acts pretentiously or affectedly, often with a sense of mild criticism or teasing.
See also: 気取る (きどる)
彼女はちょっと気取子だけど、本当はいい人だよ。
She's a bit of a poser, but she's actually a nice person.
あの気取子はいつも高級な話ばかりしている。
That affected girl is always talking about high-class things.
Compound of 気取る (to put on airs) and 子 (child, here meaning 'girl'). The exact origin is uncertain, but it likely arose as a colloquial term for a pretentious young woman.