Having a person shit on the tip of a dick and then lick it off, like someone would do to a piece of yan yan candy.
I went to japan and saw lots of young girls who were eating yan yan. I paid one 5 yen to give me a chocolate yan yan. I was amazed when she unzipped my pants and took a dump on my cock and then licked it off. Now that was a good day substituting at the japanese elementary school.