POOP - People Order Our Patties from episode "Krusty Krab Training Video" of TV show Spongebob Squarepants. The real meaning behind this naming created by the human animators is that in the sea, the burger patty is actually shit from human civilization dumped into the ocean where the fishes and sea creatures that eat Krabby Pattys are actually eating the matter of human civilization shit.
Narrator: Ah, poop! You never let us down! - "P.O.O.P." never stops falling into the ocean.