Whilst fingering a girl/woman, kit-katting is the act of getting two fingers up her snatch and two up her bum. this resembles a 4-fingered KitKat in half. This maneuovre is quite complex and is most likely to be performed on a slut or someone quite loose. The best method would be to breach the anus first, as this is the most difficult part, then proceed to her fanny. Not confirmed if this is pleasurable or just weird.
Henry - 'Hey man how was that slut last night. Any Kit-Katting action?'
Bill - 'Yeh man i managed to four finger her.'
Henry - 'Did she like it?'
Bill - 'I dunno she was passed out'