A girl who enjoys being filmed whilst having rough sex with many men up every orafice surrounded by images of wild boars. It is possible to tell whether a girl is a 'Gerty' due to her large 'assets', small amount of clothing and badly dyed hair. Commonly mistaken for an Essex Girl.
Guy 1: 'I had a very weird night with that girl i picked up'
Guy 2: 'Did she want to be filmed having sex with many men in a room full of pictures of wild boar?'
Guy 1: 'Yeh! Do you know her?'
Guy 2: 'Maybe, she sounds like a Gerty though'