1. The use of ones hand to stop the flow of fecal matter from coming out of their anus during a moment of severe diarrhea.

a popular meme in the movie Diary of a Wimpy Kid: The Long Haul where the main character Greg accidentally picks up a diaper and it gets stuck on his hand, and he keeps shouting "It's a Diaper!" while a lot of people were recording a video of him, eventually he went uncontrollably viral.

When changing a poopy diaper and you get some on your hand. Can happen concurrently with diaper foot.