1. After shagging the unintentional signs of the act that are left behind like used condoms in the bin, clothes discarded around the place.
2. The intentional trail left by someone who wants other people or a boyfriend/girlfriend to find out they'd had sex when the other person wanted it kept quiet.
I drunkenly pulled my flatmates boyfriend and had to rush out to work. I told him to tidy things up and get out of there before she came back but the fucker left a nail trail of a condom in the toilet and one of his socks by my bed.
by Bob_Bobington February 25, 2010
Get the Nail trail mug.