1. an unusually large wave or splash produced in a toilet bowl by a large or well-placed excrement (poo).
2. an exceptionally large, oderiferous or much-anticipated bowel movement.
Origin:
2011-2012; < Brinston, Ontario, Canada. Based on Japanese word "tsunami", equivalent to tsu harbor (earlier tu ) + nami wave < poo (poo) + nami (wave).
A type of person who is always there, no matter where you are. It could be like you’re the only person on the planet but you would still see Poulami around the corner.