A House Potato is an unemployed person that lives off other people's money, gives advice that nobody wants, and is in good general shape. Also brags about all the stuff she bought.
Stot telling me what to do you House Potato, I'v got a job!
An older woman's ass that is rotund and full of cellulite dimples. When they sit down, the ass seems to squish and go all over the place, as if they were sitting on a pile of mashed potatoes.
My sixty-fiveyear old teacher has a mashed potato ass. It is very distracting.