The gastrointestinal phenomenon experienced by many people after they eat Popeye's Chicken including, but not limited to, explosive and watery diarrhea, uncontrollable flatulence, and upset stomach. Normally lasts until the next ferocious bowel movement.
We had Popeye's for lunch and now Amanda has a terrible case of Popass. It's EyE-ASS-Poppin' bad.
To cup ones fart and swiftly manoeuvre the cupped hand to ones nostrils (or the nostrils of another). Useful in deciphering the health of the bowel and the contents of the previous evenings dindins.
Tarquin: 'Bertie dear boy, my olfactory sense deciphers a hint of truffle in your poopascoop. I also note a forthcoming haemorrhoid.'
Bertie: 'Jolly good show, bang on Tarquers!'
'Oh, and please may I borrow your Preparation H?'