A person, most commonly a nail-biter, who often will bite off pieces of dead flesh off their thumb, index, or little finger. once the exposed raw skin is burning and feels irritated, the color of the skin proceeds to turn red.
Guy 1: Dude, you see that guy over there?

Guy 2: yeah, that guy has redfinger, hes probably a nail biter.
by radioch December 15, 2016
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this is when your female counterpart fails to tell you that it is her time of the month and you put your hand in her pants and hence, getting your hands dirty
(Guy 1) Dude, we were goin at it, and she never told me she was on, so i put my hand down her pants...

(Guy 2) Whoa whoa... she never told you she was on?

(Guy 1) Nah...

(Guy 2) And you put your hand...

(Guy 1) Yeah...

(Guy 2) Well then... A-hoy there Captain Redfinger!
by El Nugos September 4, 2008
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