An individual with extremely fat, round fingers. Like little pork loins. Typically disproportional in size to the hand itself.
I know Roger has freakish hands with those pork fingers. But I let him finger my bum last night and I must say that felt great and the girth did leave me with a gape.
Finger porking is the phrase given to the act of being penetrated with fingers.
Girl1: what did you do on the weekend?
Girl2: oh, I was just finger porking myself all day .