To whine and complain that you don't have much money, that you're destitute from other expenses etc. when negotiating for goods or services when, in reality, you're loaded and much better off than the person you're haggling with.
"Don't let him poormouth you into doing that job for half price. He's a millionaire a couple times over."
An insulting term used to refer to a person who frequently employs foul language.
"Why, Ron, Why? Why did you say those things...you, you nasty poop-mouth. Poop...Poop mouth, get that poop out of your mouth" "Garth, If I gave you some money out of my pocket would that help ease the pain?"