I don't think she said 'ξύρες'. She most probably said 'ξούρες', and this, even according to the dictionary, is accompanied by a gesture down the cheek. From the Katos dictionary:
ξούρα, η, ουσ. [<ξουρίζω]. 1. το ξύρισμα: «κόπηκα στην ξούρα || άλα, ξούρες!». 2. (ειρωνικά) το ψέμα, η ανακρίβεια...