Nachoeeng
You and your lover are going at it, and one of you craps in the other's mouth. They swallow it, throw it up, and spit it back. They do this until they're either done or completely sick.
I had to eat my lover's breakfast. Then I had to eat it again. Then I had to eat it once more.
I thought I was in love. Turns out I was in a poop fight.
I didn't know my lover had a poop fetish. Or a vomit fetish.