Anything meddlesome. Words, opinions, actual hands. Someone with meatpaws has an opinion or certain (and only right) way of doing anything and everything and they *have* to be the ones doing it. Even things they've never seen or done before.
Uncle Herschel couldn't keep his meatpaws out of Aunt Cassie's thanksgiving dinner; that's why the turkey is stuffed with baked beans and there's cranberries in the sweet potatoes.