this is the amount of a buttoned down shirt material that is tucked in on one half of the radial torso versus the amount untucked on the other half.
Holy sh*t! He must have a button undone to have that kind of Tuck Differential!!
When you are sitting at your desk and you fart, followed by breifly pushing away from your desk, leaning down and smelling it to see the level of intensity and odor. Also to judge whether or not you should probably leave your desk.
Gary, I just dropped a bomb at my desk, but I did a quick Fart Recon and it's OK, I don't think anybody will notice.