crap bookmark
Basically "corn." If you accidentally swallow something non-edible, quickly eat corn so that you'll know when to look for said item in your stool.
Bob: Dude, I just swallowed my wedding ring!
Clay: Bro, eat some corn ASAP. When you see corn in the toilet, that’s your crap bookmark. No need to dig through stool until the corn appears.
Clay: Bro, eat some corn ASAP. When you see corn in the toilet, that’s your crap bookmark. No need to dig through stool until the corn appears.