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2. Bumfinger
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"

B: "Don't they usually take the skin from your arse?"

A: "what and have a bumfinger? ...

B: "BUUUUMFINGGEEEER"
1. bumfinger
The finger that is frequently used to pleasure the anus.
Oh no, i've sprained my bumfinger

John's bum finger looks brown. He must hae been using it.
by olly Apr 13, 2004 add a video
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