decoy shoes
Shoes you wear to a public bathroom when you expect to take a spectacular, noisy, or painful bowel movement, so that other bathroom users can't identify you by your feet.
Person A -- I've got to leave work early today.
Person B -- Why?
Person A -- I ate Chipotle for lunch and I forgot to pack my decoy shoes.
Person B -- Why?
Person A -- I ate Chipotle for lunch and I forgot to pack my decoy shoes.