When a guy leaves behind a little secret territory marker at every place he has ever masturbated, be it anything from slightly saturated undergarments, to penile excrement on the toilet seat. Put all these tell-tale signs together, and you have a fappy trail.
Mom: Goly gee gosh, I realized why there's always a crumpled up tissue tucked under my son's pillow in the morning!!! It's his fappy trail!!!
by Loberson February 04, 2016
The sexual practice of stopping whatever position(s) and/or acts you are engaged in at the moment right before orgasm to successfully paint a perfect line of sperm from your partner's naval down to their sexual organs. If you do this correctly, you will have brought into being a fappy trail.
"I pulled out, told her to turn over, and delivered the PERFECT fappy trail. I high fived myself afterwards because I was so proud"
by Loberson February 04, 2016
The small, moist trail left behind after a session of maturation in a horizontal position. When a man splooges in this position and his juice rains down upon his happy trail, it becomes a fappy trail.
Man 1: "dude I just had the best jerk off ever"
Man 2: "nice but did you make a fappy trail?"
Man 1: "hell yes! It was super sticky!"
Man 2: "nice but did you make a fappy trail?"
Man 1: "hell yes! It was super sticky!"
by Loberson February 04, 2016