Poobris
Over-confidence in regards to being finished with your bathroom business and having to go right back in after a poo.
Whoops! Gotta go back to the can, poobris got me again.
poobris
(n.) pride derived from the act of defecating and its result, esp. if expecting other bathroom patrons to experience its sickening effects; pride that cometh after the fall (as in plop)
Leaving the stall, and noticing Joe fast on my heels to use the same, I couldn't help but hear the poobris at the back of my mind grin with a dastardly "choke on that, fucker".