The reclassification of a human finger/owner of the finger following a skin graft taken from the buttocks of the individual in question. Usually but not exclusively as the result of an accident. To be uttered to the tune of "Goldfinger".
A: "Oh no, he cut off the tip of his finger, he might have to have a skin graft"
The culinary result of throwing a party, making a special salsa, then bums wander in off the street to dip fingers in said salsa, lick them clean, and submerge them again for an extra licking. More deplorable than double dipping, it is truly an unfortunate creation.
Stephanie: Frank, you're not eating that leftover salsa, are you? Bums were dipping their fingers in it!
Frank: You mean I ingested... bumfinger salsa? (vomits)