Really hot word among the young people in Finland these days. Somebody who wears trendy clothes, like lowcut jeans, giggle on her face and strong make up. You know, anyone who looks or acts like Britney/Paris.
First versions of the word were pissaliisa, lissu, kind of insultish words to describe a drunken young girl who is peeing in public without a care in the wee hours. Pee hours, more like.