fingernail fudge 

the feces under you fingernail after you have had your finger up a woman's ass. Often goes unnoticed at first due to the excitement of the moment when fucking her pussy and fingering her ass simultaneously.

I washed my hands but there was still a trace of fingernail fudge from when I was with Sherry.

fingernail fudge by Woody Thomas September 20, 2008