Zarutsky F. D., Fyodor Taras "Training the intelligence officer: the GRU special forces system" (1998)
"If there is a need to quietly lower the gases, you should stretch your buttocks with your hands and then, in order not to give yourself a smell, quickly dissipate the air with your palms, without producing shock."
yyy: I tried to do in the guests, so weirdly looked at me, especially when I took off my pants to stretch my buttocks.