The act of kissing with your asshole by placing your sphincter on someone or something and then flexing/clenching your but-hole causing a similar effect like if you were kissing with your lips. The variations are "wet" poop kiss leaves fecal matter on the targeted area. "Blowing" a poop kiss would be farting unfiltered (bare assed) within a inch of the intended target (extreme banzai crop dusting).
Travis was the first to pass out at the party so Dave decided to reward him with a poop kiss on the tip of his nose
the prank or game in which one defecates and leaves the excrement or feces (i.e. shit) in the dollar bill (can be of any amount) which is rolled around the feces, making it almost impossible to spot. The dollar is leaved on the ground in a public place where there are many people.
as seen on the Comedy Central series Workaholics
Fred shat in that dollar, rolled it up and left it in the parknext to the bench. Some idiot picked up the poop dollar and it was hilarious!