bog sonar
Whilst in the cubicle when someone else walks into the bog you listen intently (turn on your bog sonar) to determine what they are up to, in order to plan the intensity of your next squeeze, volume of groan during the squeeze, ferocity of wipe and subsequent exit from the trap to avoid exposing yourself to the defecation interloper.
I was taking a massive shit in trap 2 when someone walked in the bog mid squeeze. I had to turn on my bog sonar to make sure he'd finished before I could carry on and finish. Couldn't let him know it was me groaning and letting out that stench I'd get grief all afternoon in the office.