A fart cushion is a pillow used to muffle the sound of a fart, much in the same way that in movies pillows are sometimes used as makeshift
gun silencers by assassins.
In a situation where the sound of a fart is deemed inappropriate or embarassing,
one might grab the nearest available cushion, press it tightly against the buttocks and release the intestinal gasses. It should be noted that a fart pillow will generally not
mask the smell of a fart,
even though it will absorb some of it.