The act of farting small bits of poop left over from a long bathroom break all over the face or chest of someone from a point-blank range. This is achieved by first barely wiping one's butt after pooping, then, when one wants to get revenge, puts their butt extremely close to the face or chest of the victim and farts as hard as he or she can.
Dude 1: "Have you heard of the new revenge/fetish meme?"
Dude 2: "No, what is it?"
Dude 1: "It's called the shrapnel dropkick. Look it up on UrbanDictionary."