stands for "Awkward Restroom Dialogue;" typically used between males after a conversation is started in the most uncomfortable
of places: the bathroom. Can also refer to any awkward bathroom situation (i.e. your boss/teacher walks in).
Dude 1: "Dude, that guy walked up to the urinal
right next to me when there were clearly others open and started a conversation."
Dude 2: Ard.