Top Definition
The brown stains on one's fingernails/fingertips after either

(i) - shelling walnuts;

(ii) - or massaging a guy's prostate via the rectal route by a finger pilot or walnut tickler.

Both give the same appearance. (i) is harder to clean off but (ii) smells worse.
I've been shelling walnuts all day and despite scrubbing it I just can't get rid of my walnut finger.

That finger pilot sure has a bad case of walnut finger. Don't they teach people at MacDonald's to wash their hands at work?
by 20goto10 September 23, 2010
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