poormouth
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."
poormouthing
Someone who has money, but goes around complaining how they don't have enough cash to pay their bills or buy food,
she has a spit shined brand new lexus in the driveway, so i dont want to hear her poormouthing herself when its time to pay her rent.