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.