When, in an effort to be funny, you back up against someone and let it rip. The recipient has become your fart pillow. Another variation is fart cushion.
Ex-girlfriends make great fart pillows
by bobby the douche February 12, 2005
Practical Joke involving farting on a pillow, then briefly smothering someone with said pillow. A variation of that old classic, the Ducth Oven.
A good fart pillow involves the perpetrator shouting "FART PILLOW!!" at the top of their voice when doing the deed.
by Charlie Amos January 14, 2008