The action of wafting the air behind ones butt after farting.

The term is taken from the movie "I Love You, Man."

The act of walking through a group of people and expelling gas and doing so repeatedly

farting while walking;
walking while farting;

The practice of passing gas in a crowd of people unbeknownst to them

unleashing an unbarable fart on an unsuspecting civilian

Walking past someone and farting.

Passing gas in a stealth manor, usually while walking through a crowd or a group, so that someone else gets blamed for the stench, or at the very least people besides the assailent must suffer it.