When you can't fart because you're afraid you're going to poop your pants. This usually occurs when you've had food from a shady restaurant or have been tight-cheeking it all day.
Frannie: How are you today, Tom?
Tom: It's been a rough day. I ate Chinese last night, and now I've got cautionary anus.
Tom: It's been a rough day. I ate Chinese last night, and now I've got cautionary anus.
by Amazin' Eddie January 21, 2014