A member of the "forward crew" on board a nuclear submarine. Steretypically dim-witted and obtuse, coners can often be found in groups wondering why one piece of equipment or another doesn't appear to be working with the on/off switch positioned downward. A common belief amongst coners is that anything can be fixed by some combination of duct tape, coffee stirsticks, and a ballpeen hammer, including but not limited to televisions, computers, 8mm videocasettes, diesel engines, and toilet seats.
There's a couple coners on crews mess fiddling with the X-box..... I wonder how long it'll be before they realize it's not plugged in.