The act of putting seran wrap over someone's (or your own) mouth and then defecating onto the seran wrap. I would like to point out that a previous post claiming that "nearly everyone else is wrong" was correct except for one thing. He mentioned a rusty trombone being the act of going ass to mouth. A rusty trombone is eating out the asshole of a dude while whacking him off from the other side, giving the sound of a *bllpp blaap bllp."
"They call him Dan, but his real name should be Hot Carl."
"Why is that?"
"Because that's what he pays all the hookers to do to him."
"No, that's fucking hot!"