Commodus Interuptus 

Bowel movement deliberately interrupted due to external situations or circumstances.

When you are taking a dump and you suddenly have Commodus Interuptus due to the pizza delivery guy showing up 15 minutes early.

Commodus Interuptus by Tito C. May 8, 2008

Commodus Interruptus

When you sit down in a bathroom stall at work to escape your coworkers and play on your phone, but then someone plops down in the stall next to you forcing you to leave earlier than planned and go back to work

I was sitting in the shitter at work checking Pokémon Go when some dude came in and pulled a total Commodus Interruptus on my ass. I had to leave before my nose hairs curled too much.

Commodus Interruptus by Ed Rooney Jr July 18, 2016