1. Generally a long coat (down to the knees), that can come in a variety of styles and/or colors; can be worn over a sports jacket and tie during cold weather.
2. A ratty long black coat worn by a 14-year old social outcast pretending to be a Goth, or who wants to freak everyone in his school out by making them think he's a psycho killer. The wearer will be KO'd in the hallway sometime during the second semester.
The trenchcoat kid claimed he saw Jesus on the wall during detention this morning; someone oughtta knock the crap out of that little fuck.
To make oneself appear badass on the internet, particularly through the use of an internet-trenchcoat.
One who trenchcoats.
To have the quality of a trenchcoater.
Man, that guy on *random RPG* is always trenchcoating up the place. He really needs to get a new description.
"A man in a tattered trenchcoat with the lapels raised to cover his face. All you can see are the lit coals of his cigarette. A shotgun is attached to his back. Everyone knows not to mess with this guy."
A knee to ankle length jacket that repels rain and human beings. In a cultural example of Batesian mimicry (that is, a non-venemous species evolving to resemble a venemous one), you don't even need an actual concealed weapon underneath.
My trenchcoat keeps people from fucking with me. I still carry a blade too just in case.