A girl who, rather than think of a witty retort when insulted, will simply slap the insulter.
Usually used in reference to girls who have been well brought up, but lack the intelligence and repartee of high society, so resort to physical retorts.
Man: My, i've never seen such a successful attempt at making a dress from binbags.
Woman: *Thwack*
Man: (under his breath) What a slapper.
