Trail Run 

the sexual act of pulling out your penis before climax and blowing your load in a way that creates a trail of semen from the anus to the vagina. After creating the trail you then proceed to run that trail with the head of your penis until you or your partner is rubbed raw.

I can't wait to trail run all over my bitch tonight.

Trail Run by Skeeterman169696969 February 10, 2015

Run a trail

The act of having 2 or more males reproducing with a female

Male 1: "Aye my nigga lets a run a trail on that batty ting"
Male 2: "Aight, Imma run a trail on you too."

Run a trail by NgyahckMAN October 10, 2019

trail runner 

A runner of the more hardcore variety who enjoys running in wooded areas. A paved bike path is NOT a trail. Anything paved in any fashion is in fact, not a trail. A trail runner enjoys the elements. These include, but are not limited to, rainstorms, snow, wind, cold, heat, etc. A trail runner is generally more laid back than a road runner, and yearns to connect with nature and their bodies. Some obstacles trail runners may face are:
rocks, roots, streams, snakes, spider webs, bears, mountain lions, gigantic hills (mountains), mud, fallen trees, branches that stick out into the middle of the trail, very, very long drops that may result in death if they should happen to fall off a single track trail, dehydration, tons of blistering...

Trail runners often run much longer and farther distances than road runners do, including 50k, 50 miles, 100 miles. Many can be found in California, but are found across the US including Colorado, Virginia, West Virginia

"Why is that guy so awesome?"

"Because he is a trail runner."

trail runner by cmargheim December 1, 2007

train run 

To have several people fucking the shit out of you

How down are you to have a train run on you?

train run by allevarkanis May 1, 2018

urban trail running

the act of running home along various back roads and alleys.

"i did some urban trail running on the way home last night, you should try it some time."

urban trail running by LeBrown James January 25, 2013

run train 

to "gangbang" a girl with several friends.

Think of an actual train - one goes over the tracks, and then another. Now, say these trains were friends of some asshole, and the tracks were... you get the idea.

run train by babette January 1, 2004

run train 

When a bunch of guys have sex with the same girl one after another with no break for the girl

Yo tonight were going run train on that bitch Jenny
-Cool hopefully i'm not the caboose.

run train by bloddyazzcheese February 14, 2009