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1.
Nicotine buildup from a chain smokers who do not wash their hands once they have smoked.
Have you seen Joe’s yellow fingers on his right hand? Yes, Joe is a chain smoker. The yellow is due to the nicotine from the smoke. That’s why we call him Yellow Finger Joe.
by Don Canright November 01, 2007
 
2.
Someone whos always got an itchy ass
Friend 1: "Hey, mate how you got yellow fingers and you dont even smoke"?

Friend 2: "Because his hand is never too far away from his ass"!
by SlipperyP April 14, 2010