When a man or woman throws four fingers up a gapping snatch. This is not to be mistaken with the snack size kitkat, which involves only two fingers.
The woman receiving the sexual favour has to be a hoe bag
Adam: Did you fuck that girl last night?
Ben: No mate, just fingered her
Adam: Original kitkat or snack size
Ben: Original, she was as loose as a wizards sleeve
Adam: She is a hoe bag