The act of settling for the first girl (often grotesque) that speaks to you at a bar, with total disregard for the potential to achieve more attractive suitors. See also Vaginal Complacency
Joe's poon-trenching reached an all time high when he stood patronizing the 240 lb woman in the throwback Bullets jersey not 5 minutes after entering the bar.
For thrill-seekers, climbing to the underside of a railroad bridge or standing near traintracks as a train passes. Don't get too close because there's a vacuum that can pull you into the train. As soon as the wind starts becoming strong enough to sway you at all pull back immediately.
Shown in 2009 film Sunshine Cleaning (2009), one of the main characters goes tressling, climbing to the underside of a railroad bridge as a train went by overhead, sending huge amounts of noise and sparks down on her.