Something you wouldn't like to find left behind in the bathroom. It could also be put into a verb or a discription of someone/something. It comes from the word "boat"
"Ew, someone just ploated in the bathroom!" or "she's being a ploat today." or "my spelling ploats!"
Anyone that watches everyone else's plates during meals. They finish off their serving then wait to see who isn't going to eat whats left of theirs and asks," You going to eat that ?"
During dinner the platestalker known as Porky kept an eye out for anyone's leftovers.